You've Been Lied To-Salt Does Not Melt Ice!
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- Опубликовано: 31 май 2024
- In this video I show you that salt (NaCl) does not actually melt ice despite our regular usage of the term "melt" I show you how confusing it is and then talk about what actually happens when you put salt on ice.
WARNING:
This video is for entertainment purposes only. If you use the information from this video for your own projects then you assume complete responsibility for the results.
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Развлечения
FYI everyone, ice cream salt is rock salt. Rock salt is sodium chloride, just unrefined.
The Action Lab hey i got a question, if you left food like a slice of pizza, a piece of cooked steak, or half a fruit in a vacuum for 2 or 3 days does it rotten? Or go bad at least?
Can you left the chamber in vacuum whitout having it working for that much time?
very interesting , so l can't use table salt to make icecream?
Interesting because I've always been told that salt makes ice colder. For many years when filling a cooler with beer and ice, we'd add a kilo of salt to the ice. My belief was that it kept the ice from melting too fast. Now I know what is happening. Thanks.
Rurouni Kenshin The food in a vacuum will still eventually go bad but not as fast because you are removing most of the oxygen from the food that the bacteria that is already in the food that need to (breathe) and spread
The Action Lab no it's not!!
I thought it was common knowledge that salt prevents water from freezing. That’s why they put it on the roads before a snow storm
Salt lowers the freezing point and raises the boiling point of water. I could be remembering incorrectly, but salt lowers the freezing point of pure water to 25°F.
For most modern humans, if it isn't a phone, a car, or money, they don't want to know jackshit about it.
true, and sometimes not even their car or money
Road salt and Rock Salt is not the same. Road Salt is halite and is the Mined natural mineral form of table salt or sodium chloride. Rock Salt contains mineral impurities which is why it is usually brown or has a gray color to it.
Road Salt is also sometimes mixed with other minerals.
I think you're mistaken on one very important point here: Melting ice means turning it from a solid to a liquid. Thus you don't necessarily need to raise the temperature of ice to "melt" it, all you need do is lower the freezing point of the water it's composed of, which is exactly what the salt does. Therefore salt DOES melt ice.
Just like putting water in a vacuum chamber causes it to boil. You don't have to heat water to boil it.
The thing is, this guy often exchange the term "boil" and "evaporate". While evaporate means turn into gas, does not require heat, the action boiling does.
@@BaronKsatria This is just an every day guy who likes science, not a scientist.
He’s dumbing it down. Unfortunately this hurts the world rather than help it.
As explained in the video, the ice is already melting. The salt only prevents the resulting water from turning back into ice.
Semantics. Salt melts ice, it accelerates the phase transition from solid to liquid by inhibiting the refreezing of water.
it's not even semantics, melting is any change in phase from a solid to a liquid, he's just factually incorrect.
@@MechanicusTV actually melting is a phase change from solid to liquid due to an increase of temperature. The salt does not increase the temperature (it is not exothermic) of the ice/water it only lowers it's freezing point; it is still only melting due to ambient temperatures being higher than the waters freezing point.
If what you said were true, and the salt is what is melting (changing states due to increase in temperature) the ice; salt water should never freeze (sea water freezes at around 28F/-2C).
Not semantics
Nuance is the word u'r looking for.
Yes the end result is liquid salt water, but the way we got here was not by adding heat to melt. Rather it was to prevent water that would usually freeze from freezing.
So saying 'salt melts ice' is leaving out important parts of the story.
@@Mattjammar I know this comment is a bit old, but that's an incomplete definition of melting. A better definition, as given by the IUPAC Compendium of Chemical Terminology: "The conversion of a solid to a liquid by the application of heat and/or pressure." The pressure component is really important.
@@9-seven yes, but salt doesn't change either the amount of heat or pressure on/in the ice; so, the extra definition doesn't change anything here.
The salt just mixes with already liquid (already melted) water on the surface of the ice to create a solution with a lower freezing point, and doesn't refreeze unless ambient temperature get significantly lower.
"Salt does not melt ice."
*shows salt melting ice*
"It's not melting, it's just making solid ice form liquid water."
No, it's making water NOT turn back to ice. Did you watch the video?
I know right it’s stupid
😭😭😭😭
Here is a simple experiment for you guys to do and test this for yourselves get a plate a matchstick or a toothpick Ice Cube and salt must not be cube salt
Put the ice cube on the plate put the matchstick on the ice then throw the salt on top of it then you tell me what happens
and please
@JawbreakerNoah do test this the only stupid thing here is your inability to experiment for yourself you judging something you didn't experience
@@valeriobertoncello1809 the action lab is 100% incorrect here it's melting the ice by lowering the freezing point.... it's still melting. it's still a phase change.
If the definition of “melting” is when a substance changes states from a solid to a liquid, then salt does, in fact, melt ice. When salt dissolves in water, it changes the chemical makeup of the substance so the freezing point is lower than 32 degrees Fahrenheit. The reason that the water can drop to below 32 degrees after adding salt is because the ice that is already in the cup is below 32 degrees and the liquid salt-water that results from the addition of the salt is able to drop to the same temperature as the solid ice because its chemical properties change.
I fully agree. In fact I felt a little trolled by this video because there was no new information here for me, as I already understood everything presented. However playing action labs advocate, if you look for a definition of melting you can find this one, "make or become liquefied by heat." with this google query, "define melt". And if the definition requires heat then yes salt does not heat ice and does not melt it. Again however, I do agree with you that the definition should incorporate the change of state from solid to liquid and not depend entirely on heat.
+Brew Sauce Definition of MELT in Merriam-Webster dictionary.
transitive verb
1 : to reduce from a solid to a liquid state usually by heat
2 : to cause to disappear or disperse
According to the first definition, salt does melt ice because heat transfer to ice does happen during the melting of ice with the use of salt. The small amount of ice melted by the salt initially would become super cold when heat energy in the saline solution formed is absorbed by the ice to meet part of its demand for latent heat required for melting. As the saline solution becomes super cold, it is able to absorb heat from the air much faster and transfer the heat to the ice for melting. The definition does not specify where or from what the heat comes from. It only specifies that heat is used on the solid to be melted during melting. The word HEAT in science is not limited to energy that people can feel as warmth. It also includes energy in the movement and vibration of the molecules in the saline solution under 0 degree Celsius.
According to the second definition, salt also melts ice as the molecules in the ice are dispersed to form water after salt is added. Under this definition, heat transfer is not under consideration at all.
Obviously, you were mislead by The Action Lab guy's wrong idea that heat was not transferred to the ice during melting in the presence of salt just because the remaining ice became colder. The ice, or more specifically surface portion of the ice, did receive heat energy from the salt (a very small percentage), from the water formed from ice that melted (less than 30%) and from the air (more than 70 %). Since 1 gram of ice at 0 degree Celsius would turn into 1 gram of water at 0 degree Celsius after absorbing 334 joules of heat energy, that means giving energy to ice will not cause the ice to rise in temperature. However, the super cold saline solution formed after giving latent heat to the ice for melting can cause the remaining ice to become colder and gives the illusion that heat energy has not been transferred to the ice during melting.
big brain time
NEEEERD
i just gained my braincells
The explanation about why salt goes on the ice when making homemade ice cream is exactly why I looked for this video so thank you!
Give them a 30-45 minute discussion on the laws of thermodynamics. One of the best lines ever
Salt lowers the freezing point by a process called "freezing point depression". There's even a chart of constants for Molal Freezing Points, which depends on combinations of elements put together. This impurity so to speak can lower the freezing point causing mixtures to liquify again, since the mixture now interferes with the ability of any one element to freeze as before. Besides lowering the freezing point, the boiling point is usually also affected. Interesting experiment: Boil water in a microwave until it bubbles. Remove from the microwave, wait for the bubbles to just stop, then quickly add a handful of salt and watch it boil again (careful, it may boil over). Most people expect "melting" to be defined as "to become altered from a solid to a liquid state, _usually_ by heat [not always]" (as many online translations state in general), it is *not wrong* to say salt melts ice at all in that context.
Yep. Like he said
The Experiment with the bubbling has a different reason. Tm and Tb are ALWAYS pushed apart by dissolving Something in a liquid because it lowers the chemical Potential. Salt water therfore boils at a higher temperature.
The explanation of your experiment has to do something with the (easier) formation of gas bubbles on the surface of the salt crystal. Try the same with coke, the CO2 bubbles out faster when you add salt ;)
@@larrybrewer6982 he specifically said it doesn't melt ice, by showing it melt ice
@@tjfjt There are two processes going on as he stated, there is constantly liquid turning to ice and ice turning to liquid. Salt makes it so the liquid cannot turn to ice, so technically, it's just stopping the water from freezing.
Sure, he's being a tad bit over semantic, but it's for the sake of the video and lesson
It lowers the freezing temp and attempts to stop ice from forming, you need to apply it before walkways and roads have ice covering them..........
but only a few degrees go an look at wiki or so
Gustav Plettig it’s a big difference still
Lowers?
Gustav Plettig
Don't look at Wiki. Wiki is for retards who don't know how to properly research
0422Juls yes, instead of h2o freezing at 32F at sea level you can lower its freezing temp to the mid to upper 20s with the right salts
That's still melting the ice lol..melting means turning it into a liquid
Lana Banana it doesn't do that though. It just stops it from freezing again after it melts on its own.
+Kun Kodiik that’s a good way to say it!
Saying salt doesn't melt the ice gets into semantics. I'll have to go back and watch all your videos to see if you ever say your vacuum pump is sucking out the air, which it doesn't.
Eric Kehoe damn came here in and roasted
+Eric Kehoe I actually did a video on how nothing actually sucks. but yes it is getting into semantics but it’s just an interesting way to teach something and a way for nerds to annoy regular people
"Salt Does Not Melt Ice!" - Shows a video of salt melting ice.
ikr misleading title
I heard this comment in my head the moment before opening the comments and it was the 1st one.
My thoughts exactly!!
@@fredmench4552 🤣
The salt is not melting the ice. The salt is literally just making the ice melt itself.
The only reason I watched this video is because I know they use salt on roads to keep them from freezing but they also use salt on icecubes in coolers to keep them from melting longer. These two facts always clashed in my head so thanks for explaining ✌🏻
I've never heard that salt melts ice. I've heard and witnessed it cracking the ice to make it safer to walk/drive on.
Did you watch the video, the dude just said that salt prevents water from freezing. (But he did only use ice cream salt, so my argument is false.)
+Aqua Fyre You do realize it's not the salt in water that keeps the oceans from being frozen right? If the world were cold enough to freeze entire oceans we would be living in an Ice Age.
BreAnna Phillips
My thoughts precisely
I don't event think salt is advertised to melt it either.
BreAnna Phillips My science teacher always said salt melted ice, never believed her, it seemed stupid.
+Random Person :3 If someone tells you that you a hair dryer dries hair? Do you think he/she is stupid too? We know electric energy from the power plant ALONE can not dry your hair. A hair dryer WITHOUT electric energy from the power plant can not dry your hair either. It takes the hair dryer and the electric energy to work together to dry your hair. Therefore, depending on the circumstances under which the conversation is made, you may credit the hair dryer or the electric energy or both for drying your hair but WITHOUT DENYING CREDIT TO ANY ONE OF THEM. Therefore, you should not claim a hair dryer doesn't dry your hair by arguing that it is electric energy alone that dries your hair because that is stupid and does not agree with the fact that it take both of the hair dryer and electric energy to work together to dry your hair.
Ice cubes don't melt inside your freezer no matter how long you keep them there . However, if you put a lot of salt on the ice cubes and keep them in the freezer, the ice cubes will melt in a couple of days. Stop being misled by the stupid claim that salt does not melt ice. Yes, salt melts ice. That's a fact.
"Salt doesn't melt ice!" ::proceeds to melt ice with salt::
Ok, I actually do understand what's being explained. It was just an amusing visual is all.
Fantastic explanation that is easy to understand. Thank you. I am excited to show this to my class.
So if salt doesn't melt ice how come there was way more water in the cup with salt then the cup without salt
@Joey, 4:32 - 5:09
Basically salt interrupts water from crystallizing.
MrUnknownzz1 aka melting
@@ultimate9worrior663 melting is when solid turn into liquid.
Prevent liquid from turning into solid is not melting. Its like cook stove of water inside a freezer. U cant say the water is melting when it already fking melt. It just prevent water from freezing.
Same with this.
They melt at same rate except the one without salt freeze back again while the salt ice doesnt. Use ur brain omg.
@@realdeal5712 salt melts ice. I put Epsom salt on ice in my backyard and it melted. The areas where I didn't put the salt, the ice was still there.
@@mayo8708 There's always water on ice, the salt prevented this from turning back into ice.
What should be done is do this experiment at room temp, freezing (0C), and even lower maybe -10C so the salt still can't melt the ice by lowering waters freezing point.
That way it would show that ice "melts ice" but only if the surrounding air is at a certain temperature.
Salt lowers the freezing point to -16C
Nope, salt lower the freezing point of water to -21*C
I DO NOT agree with your title. This is a truly tricky question, or should I say the definition of melting is not well defined. Salt here plays a key role to interrupt the crystallization of ice, so that the cold water will stay in liquid form. It is sorta like the salt decreases the melting point of ice to a much lower temperature. But I still don't agree with the title. The melting point & boiling point of matters can be affected by many factors, such as pressure, purity, etc. Salt here will make the water not pure, hence the melting point will change. It is just like you can not make a conclusion by saying the heat does not boil the water, the pressure does, then showing people the water with room temperature can boil in a vacuum chamber.
I agree with you
But the common misconsception is that salt melts ice BECAUSE it adds heat to it. It's like people believing that low pressure makes water boil faster because low pressure air is hotter than high pressure air. I think the title is OK tbh.
Exactly!!!!!
When you sprinkle salt onto ice, it make ice colder but it melts way below 0*C. Salt is sodium chloride and when sodium and chloride ions bond into water, it melt the ice and prevent ice from freezing back. This give a new freezing point at -21*C. The title is MISLEADING!!!!!
The process of melting is turning a solid to a liquid you learn that at school
exactly
theprogamer9001 But the salt ITSELF doesn't melt the ice, it only takes the surrounding heat from the air and can transfer it into the insulating layer of water on the ice causing an endothermic reaction, cooling down the ice more while preventing the absorbtion of heat by refreezing on the ice.
Zach Darnell just like a hammer "doesn't break things", just transferring its energy to the object being hit? I think it isn't misleading to say that salt melts ice. It's not the most direct cause for the ice melting, but it is fair to say its impact and casual effects are quite direct.
Pedro Franca The ice isn’t melting. The definition of melting is the change from solid to liquid via adding heat.
There’s a thermodynamic equilibrium between the water molecules which causes the surface to change between liquid and solid at all times on a molecular level.
The addition of the salt ions into the water molecules that thermodynamically shift between liquid and solid cause the liquid to shift out of equilibrium and prevent them from once again becoming solid. This happens at or slightly under the freezing point of water.
Or you could just say it “melts,” and I don’t think anyone’s day will change that much hahaha.
David Barney I mean, I can try to comprehend it might technically not be classified as melting (still, I think melting should be attributed to any kind of fusion,whether due to inbalences, pressure or temperature changes).
Stiçl, claiming in the video title ice doesn't melt seem misleading,and even a bit clickbaity, ehich is what made me angry at it all. It's lile I made a video claiming someone wouldn't fall when in the air just to find a cheap loophole around the definition of falling.
but ice turning to liquid is the definition of melting......
Yeah that's what I was thinking
Wait did he say liquid water🤣
He actually showed that salt indeed melts ice, no matter what :)
Actually it does melt when it reaches the melting point, you're right.
But salt dissolves on the now-liquid water and makes it so that the needed temperature for it to return into ice to be much lower than pure water
So actually salt doesn't melt ice, it just stops it from freezing at 0°C as said in the video, this is called "Cryoscopy" in Thermodynamics i believe
Interesting how you completely missed the point of the video and then came to the comments to spew misinformation...
Melting=going from solid to liquid so the ice IS melting
I've never understood why we salt roads and walkways. Yet we always put salt in our coolers for camping and it worked.
This really helped and made a lot of sense. Thank you.
Others have already commented on depressing the freezing point. In addition, the change in equilibrium results in shifting the water from the solid state to the liquid state - also known as "melting". When ice melts, it absorbs heat - and this is why the resulting mixture is much lower in temperature. The reverse is also true - freezing water releases heat, as can be seen by supercooling water and then disturbing it to make it suddenly freeze - it releases a fair amount of heat to the container. This is because of the different energy states on either side of the phase change. You also see this with the liquid/gas phase change.
Claims salt doesn't melt ice, then proceeds to demonstrate that ice with salt poured on it melts faster than the control.
Well done. XD
Anyway///
Incidentally this does in fact mean that the salted ice melted more.
Of course, the actual reason for that is because the temperature at which salt water freezes is lower, which means suddenly it can still be liquid at below normal freezing temperatures.
The temperature going down is because the reaction is endothermic, but the reason it creates water is because the freezing point of the mixture is lower, hence the combination already has enough energy to melt.
You’re right. Melting is the process of solid turning into liquid. Salt increased the speed of melting.
Yeah. But the author seems to DEFINE "melting" to mean/imply "heating", which I don't agree.
It lowers the freezuing point of water
leesaudan Agreed, I thought he was going to make the argument that the salt doesn't increase the rate which the ice will liquify... Which is what I assumed melting is, the ice turning from a solid to a liquid state... Maybe the our understanding of the definition of melting is how we've been lied to. Lol.
I had an experiment in elementary school where we saw the effects of salt on the change of state water was in. Anybody had the same thing?
Gabriel Buchbinder Why would you reject it? That is what salt does. As said in the video, it effects the equilibrium of the ice which prevents it from turning back into ice. It just doesn't heat the ice in melting.
Chase Daly good dammit how the hell did autocurrect messed my comment this bad, thanks.
+Chase Daly When the weather becomes warmer after a snow storm, ice can melt by absorbing heat from the air above 0 degree Celsius directly. However, if the air temperature remains below 0 degree Celsius during and after a snow storm, the heat in the air alone is unable to melt the ice because without the presence of salt, ice melts at 0 degree Celsius. If we put salt on ice in sub-zero air temperature, the salt ions would lower the melting point of ice, allowing the ice to start melting. As the ice starts to melt in the presence of salt it needs to absorb huge amount of heat for melting. The ice absorbs some of that heat from the salt solution just formed and the salt solution becomes colder than the sub-zero temperature air. As the salt solution becomes colder than the sub-zero temperature air, it is able to absorb heat from the air and then transfers heat from the air to the ice to meet its demand for latent heat for melting only but not in raising its temperature.
Therefore, salt preventing water from refreeze is NOT THE ONLY REASON why ice melts in the presence of salt. Salt can INITIATE the melting of ice at sub-zero air temperature due to its ability to lower the melting point of ice is another major reason why we say salt melts ice. Without the action of the salt ions on the ice at sub-zero air temperature, the ice just can not start the melting process on its own, so the effect of salt preventing water from refreeze that you and The Action Lab guy credit as the only reason for ice melting also can not happen.
As salt starts the melting of ice at sub-zero air temperature and enables the ice to continue to melt when ice alone at sub-zero temperature just doesn't melt, it is justified to say salt melts ice.
Gabriel Buchbinder that change of state is called melting lolololololololololololol
Thanks for this explanation.
I didn't think about the equilibrium the ice and water want to stay in, so i was confused why more and more ice turns into water without energy being added.
"Half hour to 45 minute discussion on the laws of thermodynamics" Hahahaha
lol. Even before watching this video I knew that salt just lowers the freezing point of water
That still doesn't melt ice on its own. It does if you can apply the salt before the ice, but here, since it's already frozen, that's not good enough. It also needed warmth from the room.
Eetu Suutari
You must be a genius
+Eetu Suutari No, you are wrong. Salt does not JUST lower the freezing point of water as you and The Action Lab guy claim. Salt also INITIATES the melting of ice at sub-zero air temperature when ice does not melt on its own nor does the heat energy stored in the sub-zero temperature air able to melt the ice. Salt is one of the two essential factors that cause ice to melt at sub-zero air temperature and it is the factor that starts the melting in such condition. Therefore, it is justified to say salt melts ice without discrediting the role played by heat in the surrounding.
This was my reply to Real Deal under Gina Lola's thread:
"Reforms into a solid' for water means "refreeze" . The ice needs to be melted first before it can "refreeze" into ice. Salt can initiate the melting of ice at sub-zero air temperature . Salt can also prevent the water formed from melting ice from refreeze into ice. BOTH of these two properties cause ice to melt faster than when no salt is added. Therefore, it's no illusion that salt melts ice. A electric hair dryer can dry your hair faster. It is foolish to claim that a hair dryer does not dry your hair faster by arguing that it it only prevents water from sticking on your hair."
However, the Chrome browser prevents my reply to Real Deal from posting but Firefox browser allows my reply to be posted to him. I wonder why Google chrome is doing this.
+David Typical reply from a common core minion. No logic, no reasoning, no sensible counter argument. Just abject denial.
*S a l t y i c e*
Bob McCoy *B O I*
Ice doesn't get salty. Even icebergs on the sea are formed by fresh water only.
www.quora.com/Are-icebergs-made-of-fresh-water-or-salt-water
F R O Z E N B O I
Ok
B O I
Action lab is the best channel for learning new stuff in RUclips you just cleared my confusion which I had while reading my text book
I know why it "melts" the ice! It's because it lowers the freezing temperature because brine freezes at 0°F and water freezes at 0°C and when the salt dissolves into the water, it makes it brine. This was super interesting, thanks!
oh wow how cool is that. l loved it and now l know why l use salt to make ice cream ice colder, amazing!
Please don't believe this guy, salty ice water gets colder for different reasons than he is alluding, yes it gets slightly colder because endothermic properties but the main reason is that the "coldness" of the ice is better dispersed through out the solution, because it is no longer freezing, his video is frankly dishonest because it is melting, the freezing temprature was just reduced and because of the equaliberium reason, it being cold has nothing to do with it changing from a solid of a liquid aka melting, like steel melts at a really high temprature for example
Momma O what??
+moneyman295
Uh..what?
His video was about the fact that salt isn't what is melting the ice. The salt is adsorbing the liquid, making the liquid even harder to melt, which ends up with the water that the ice is on not being able to freeze anymore, therefore making the impression that salt is what is melting the ice but in reality that's not what's going on at all.
He even makes a clear point that calcium chloride is a much better additive to melting ice because it makes everything around it hotter, not even colder.
What this also does is make the ice a lot harder to freeze, resulting in needing even colder temperatures.
Why else do you think the oceans never freeze unless the temp's get below -c? The temps need to get even colder because the rate at which water adsorbs how cold the air is around it takes quite a while.
After a while, if the left the glass there, the entire water area would freeze with all the ice inside of it. You could clearly even see ice already forming on the sides of the glass.
+Nighterlev Please stop pretending that you know the physics about salt melting ice when you don't.
Your statement "The salt is adsorbing (absorbing) the liquid, making the liquid even harder to melt" is ridiculous." Nothing can make a liquid harder to melt because a liquid (water in this case) has already melted.
Your statement " What this also does is make the ice a lot harder to freeze" has a similar mistake. Nothing can make ice harder to freeze because ice is already a frozen solid.
In physics, we talk about melting of a solid and freezing of a liquid, not freezing of a solid and melting of a liquid as you talk about ignorantly. Your explanation that "salt absorbing the liquid" (water) as the reason why ice melts in the presence of salt is just nonsense and non-scientific. Paper can absorb water too but paper with the temperature of the ice is of no help for melting ice at all.
Without the presence of salt, ice at sub-zero air temperature just would not melt on its own so there would not be any water to be absorbed by anything at all. However, when salt is put on ice at sub-zero air temperature, the positive and negative ions from salt would help to dislocate the lattice of polar molecules of H2O in the ice due to the attraction of opposite charges.
Salt melts ice is a scientific fact. Your attempt to deny that fact with your false explanation is just pathetic.
+simon6071
Let me put it in some of the most basic ape like words for you to understand, because clearly you don't understand the science behind any of this at all.
Ice sits
Salt gets poured on ice
Ice starts melting due to the salt creating salt water out of the ice
forcing the ice to melt further because it has no water that constantly
freezes anymore on the surface of said ice
Ice then becomes salt water at the bottom of the glass, forcing everything get 5x colder (salt water is generally colder then fresh water in the same environments)
Then what happens is the ice stops melting completely, and you now have a glass which is literally freezing over as if it's the next ice age.
I'm sorry, but you're confusing "melt" with "gets hotter". Melting is actually the phase change from a solid to a liquid. The salt does, in fact, facilitate that change. When the salt is dissolved in the water, it lowers the freezing point of that water thereby not allowing it to refreeze despite the "freezing" temperature. It forces the water from a solid state to a liquid state, which is exactly what melting is. It does melt the water by reducing its freezing/melting point to a point that is lower than its current temperature. It has the added benefit of absorbing heat in the process which is what helps freeze the ice cream. The salt forces the water to change phases, which requires energy, which is removed from the ingredients in the ice cream maker, which turns the ingredients into ice cream.
It's really simple. The ice dissolves into the water, which lowers the freezing point of the water initiating a phase change. That phase change is what the word melt means. That phase change requires energy which reduces the temperature, yielding the condensation and frost on the outside of the glass. If you had a vial of water inside that glass of salted ice, it would freeze. (Assuming you didn't salt it too) In fact, adding any solute to the water would do the same thing. Table salt is just readily available and extremely easy to dissolve. It's also extremely safe and extremely effective. You could do the same thing with sugar, but it's a bit slower and much stickier.
No, he's not confusing "melting" and "getting hotter". There are two processes going on as he stated, there is constantly liquid turning to ice and ice turning to liquid. Salt makes it so the liquid cannot resolidify once it has already liquified (at the same rate that the ice without salt would liquify). So technically, it's just stopping the water from refreezing, there was no increase in the rate at which the ice liquifies.
Sure, he's being a tad bit over semantic, but it's for the sake of the video and lesson.
Funny I can learn more from you in a day than going to school for 18 years lol
Lmao me when I mess up my experiment in chemistry but still have to right the conclusion
Roses are Red
Violets are blue
*Salt melts ice*
*but it doesn't **_heat it_*
"Salt doesn't melt ice."
*throws salt on ice to melt it*
"It's not actually melting."
*throws salt into water and proceeds to explain exactly how salt melts ice*
there's many smart comments here you can feel free to read if you're confused by this.
@@Broockle someones hurt
@@USBYDProductions
o no
Actually ice has a thin water layer that repeatedly melts and refreezes. So when you put salt on top, it mixes with the water layer preventing it from refreezing. This slowly "melts" the ice as the ratio of salinated water increases. The effect depends on ambient temperature of course. This should be better seen on some ice crystals in saline solution under a microscope.
A few questions. In case of subzero temperatures, will there be a physical equilibrium between ice and water? If yes, how does this phenomenon take place? Is it to balance out the vapour pressure and the atmospheric pressure?
I thought the whole point was that saltwater is harder to freeze than freshwater. It doesn't warm it up. It just keeps it from freezing.
Thats Not a Knife, This is a Knife This is exactly what happens. I've never heard anyone say salt melts ice.
Thats Not a Knife, This is a Knife thank you
Lucas Eckel Agreed, though my old science teacher told us repeatedly it melted ice when we had to figure out how to melt this huge chunk of ice in this weird group contest.
“Hey Siri...remind me to never use this video to teach science.”
Best explanation ever! thank you so much!
This is interesting. I always knew salt made it colder, but I had no idea how poorly it actually melted it. I have a question. Here in Norway and probably other places they use salt on the roads during winter to de-ice it. They probably use calsium chloride but it is a huge problem, cars rust. Which is why classic car owners like myself keep our cars in the garage during winter. I digress, my question is; what is a better alternative to salt to de-ice frosty roads, which is better for the environment and our cars? A solution that isn’t making our cars rust. Thank you for your awesome videos :D
I disagreed with just about everything he said. Salt increases the local entropy, but doesn't change the specific energy. That is why the temperature drops. That increase in entropy is the same thing that happens when you warm something up. Increasing entropy to change the phase of a material is generally referred to as melting... The temperature change part has nothing to do with the phase change. The liquid water simply speeds up the mixing by increasing the surface area of contact by dissolution of the crystals. Put the ice in a hard vacuum, then put salt on it and watch as the ice sublimates at a faster rate. Then tell me that salt doesn't melt ice... (Please note that the vacuum theoretically prevents the ice from getting heat easily. It will also not be a fast process.)
Unmannedair I think what you’re getting wrong is the ice has to be below the freezing point of water but above the freezing point of saturated salt water.
Not sure what would happen to its triple point in a vacuum. That might make an interesting video.
I poured red liquid salt on ice and it melted. Also melted my hand. Might need a certain type of salt to melt it
Tredon Aldridge or certain kind of salt
+Tredon Aldridge in that case, yes it melted ice😂
Masked Wolf Legend that's what I meant
The Action Lab lol
Hi
does this lowering of the freezing point work with Sodium hexametaphosphate (SHMP)?
I see that there is a lot of confusion in the comments, so I will try to explain it: the ice, even without salt, is constantly melting, that is, it becomes liquid, but at the same time this liquid is constantly turning into solid ice, it's called equilibrium. But when we add ice to it, the freezing temperature of the water drops, so the ice will still continue to melt, as it normally does, but the liquid obtained will not be able to return to its solid ice state, and that's the reason why we see that the ice melts, however it is not the salt that does it, but it prevents the ice that has turned into water from returning to its solid state
"I'm going to show you your whole life us a lie. Salt does not melt ice." Universe implodes.
*shows salt melting ice* "uhh... but you see... its.... its... THERMODYNAMICS because... salt lowers the temperature of ice and dissolving is slightly endothermic sooooo checkmate?
actually it's still ice, the salt just converts the ice into a liquid ice, but not water because that would mean melting. liquid ice, cuz cold!
That's a false and sensational claim made by The Action Lab guy. It's not the right attitude when the subject matter is science.
Pete Lorenzo liquid ice is water. Are you dumb?
thomas: 'Tis sarcasm. He is making the argument sound ridiculous on purpose because it is.
"Let's do Celcius for everyone"
What is a subscribe "buh an"
No
We were wondering for more than a decade why do ice cream sellers put salt on their ice. Thanks! I just found the answer!
I learn more science from this guy then I do from science class. Modern day Bill Nye 2.0
Dude you turned this into a semantic argument not a scientific one. When the average person says "melting", you and I both know they mean phase transition. If you put ice in a vacuum chamber, wouldn't it also "melt" despite the temperature going down? Are you going to claim that doesn't count as melting because the energy level didn't increase?
Also, I can't find anywhere that defines melting as heat related. It's a phase that can be achieved through combinations of temperature, pressure, and additives alike.
en realidad la sal solo evita que el agua que ya se ha ido derritiendo vuelva convertirse en hielo como lo explica en el min 4:40
@@sebassrosr w0t
*you've just seen an unoriginal comment*
So would it make a difference if you chilled the salt first instead of it being room temperature?
thank you! I remember trying this as a kid
The salt just lowers the melting temperature of ice. It makes it so the ice will melt at colder temperatures. The salt itself does not melt the ice
KrazeeCookie ¿
+KrazeeCookie The salt does melt the ice due to the action of the salt ions on the polar molecules of the ice. Even though heat from the air is required for the melting of ice , salt's ability to turn the water into a super cold salt solution would speed up the transfer of heat from the air to the water and from the water to the ice tremendously. Therefore, it is justified to say salt melts ice just like t is justified to say a hair dryer drys our hair even though it is is just an appliance with the ability to transform electric energy from the power company to heat energy and kinetic energy for drying our hair.
lolgaming if you make ice cold enough it melts. must be a buffer overflow in the matrix.
+logaming 323 Salt makes the surface of ice melt first and then the colder than air salt solution formed makes the remaining ice colder. However, the ice can continue to melt in spite of becoming colder because salt can lower the melting point of ice.
Maybe I'm missing something, but you just proved that salt DOES melt ice.
No, ice melts itself, and it melts itself all the time. Ice is also constantly melted by air. You just don't see it because it almost immediately turns back to ice. Salt just hinders this process of water turning back to ice. He stated it clearly in the video.
You could say salt _highlights_ the process of ice melting (due to air or due to itself), by keeping the melt ice in liquid form. But salt itself doesn't melt ice.
@@valeriobertoncello1809so by observation salt melts ice.
but scientifically salt just slows or prevents water from refreezing
Salt does not melt ice....
I did this science project in school. It doesn't it just makes it longer to melt
@@pyroromancer That's merely a mechanistic explanation of how and why salt melts ice. The fact is, salt melts ice. How it does that is irrelevant in the context of the present discussion.
@@zakmartin w0t
Thank you for all your work
+The Action Lab:
If you caused ice to become liquid by placing it in a high-pressure chamber, at constant temperature (better yet, ensuring that the temperature decreased as the pressure increased), would you not call that change melting?
wait I'm so confused
The ice with the salt on it has melted 6 times faster right
Its just colder
does that change the fact that it melted 6 times faster
That's not the problem... The problem is if it is colder then why doesn't it convert back into ice....
Nevermind the answer is in next comment...
@@nayyarrashid4661 where
I have never heard of salt melting ice
if the ice with salt added were to melt there would be more water in the glass. funny, there's more water in that glass. the ice became water, but it didn't melt. magic?
very useful for delivery of cold drinks, thanks.
What's the video called where you demonstrate why metal feels cold when it's the temperature as everything else? Need to show my daughter.
Never been told that I already knew that salt lowered the melting/freezing point of water and Im 12
1. You need a lot of salt.
2. Are you saying my whole life is believing salt melts ice?
Corey Newhard It’s actually just the wrong type of salt.
thanks a lot sir i was so confused about this concept of depression of freezing point
Next experiment. Take a hotplate, thermometer, and beaker of water to summit of Mt. Whitney. Then try to convince me it's not boiling because it never reaches 212 F. Suggested title: "You've been lied to - a Hotplate does not Boil Water!"
Melting is a phase transition, heat flow is irrelevant. Salt does melt ice by changing the melting point of ice. Adding salt to water drops the temp a little, as shown. Melting requires a lot of energy. By melting the ice without providing external heat, it doesn't get a little colder, it gets a lot colder. The latent heat of fusion is being pulled from the system itself.
This whole video is so misleading, hard to believe it was never taken down. You are exactly right about the tiny temperature difference from the salt dissolving, vs. the large amount of heat needed to melt ice. They are not remotely comparable, and if he thinks they are then he has a very poor grasp of what is going on.
So during icy weather DMV is pouring salt on the roads to prevent ice from forming in the first place. Interesting.
Well yah, because salt does melt ice.
"Prevent Ice from forming" "Salt does melt ice" YOU CAN'T MELT WATER JESUS AHHHH
Dizastermaster, what? it does both. If you put it on a road, it prevents ice from forming (to a certain point of course). If you put it on ice, it melts it. Whats so hard to understand?
It doesn't melt ice
except it does. Putting salt on ice will make that ice melt much quicker than unsalted, and even melt ice that would not melt before. So if its 30 f out, the ice wont melt. If you pour salt on it, it them melts. So yes, salt melts ice. (up to a certain point, past that, the lowering of the ice's melting point doesn't help much.)
Salt should cause the freezing point of water to drop from 0 degrees celsius to about -20
That wouldn't instantly cause melting though; heat still has to be applied.
It does however mean anything in contact with it gets a lot colder, hence why it can be used to help make ice cream.
So ice in your esky is a valid way of making it colder.....but for longer? Does the broken down ice loose its cool quicker than in solid form?
it IS melting the ice.. it just doesn't melt it with HEAT.. NaCl interferes with the kinetic molecular bonding of H20. You should've been more clear about what's happening. Salt decreases the FREEZING level of water, so that it needs to be below the typical freezing level in order to turn to ice. Since the outer portions of the ice that is in contact with the warm air is above this temperature, it turns to liquid quicker.. which means it is melting the ice. Unless you could desalinate that water without warming it, it will remain liquid. I feel like you just ended up confusing people more with this video.
+dan428 The outer portion of is not liquid just because the temperature. Even if the temperature were below freezing there would still be a layer of liquid on the outside of the ice due to the disruption of the molecular lattice of the water to air interface. The point of the video is to explain that ice turning to liquid is an equilibrium phenomenon and not a heat phenomenon.
The Action Lab I guess the issue was with the title because as you said.. melting is the process of ice (or any solid) turning to liquid (not just the outer layer) even if it’s not by process of heat absorption. Just like boiling is when it reaches boiling point even if it’s not being heated. Maybe you’ll do a follow up video or experiment clearing this up? I get what you’re saying but to most people the debate about the word “melt” will just confuse the issue and wasn’t fully explained.
But I did like the video.. I was surprised to see just how cold the melted water was! I think if you poured more salt after the initial melt you would’ve gotten even more liquid.
agreed, it's an equilibrium phenomenon, if you agree that melting is a change in material phase not a change in temperature.
@@TheActionLab Pratt, you said it doesn't melt ice but it does end of
This is a joke.... right?
no... watch the video..
Argon nope
Sadly not. I hoped it was.
killerjilk why did you hope it was a joke?
Unigardy, because I had hoped something as stupid as this would be a joke and not actually a real thing that this guy is arguing.
Salt stops the ice crystal formation, even if it's cold it can't freeze or refreeze because ice can't form
So essentially whenever it snows up north or really anywhere they use calcium chloride to melt the ice on the roads correct?
In my language melting is
The process of a solid turning into a liquid
This is true for salt and ice
Come on, people. In ice there are two processes going on, there is constantly ice turning to liquid (melting), and liquid turning to ice (freezing). Adding salt makes it so the liquid cannot _refreeze_ once it has _already melted_ (at the same rate that the ice without salt would melt). The salt is stopping the water from _refreezing,_ there was no increase in the rate at which the ice melts. Stopping water from freezing, and melting ice, are not the same thing.
Sure, he's being a _tad_ (ok, maybe a tad more than a tad) over semantic, but it's for the sake of the video and lesson, and he's technically correct.
No officer, I didn't kill him. I just inhibited him from remaining alive.
When you add salt, that temperature drops: A 10-percent salt solution freezes at 20 F (-6 C), and a 20-percent solution freezes at 2 F (-16 C). On a roadway, this means that if you sprinkle salt on the ice, you can melt it. The salt dissolves into the liquid water in the ice and lowers its freezing point.
Salt in Liquid Nitrogen!
It wont dissolve
Nathan Dryer the most boring experiment ever
You need to take basic chemistry... cause you are just giving false information to people.
yup, that's why I'm triggered by videos like this.
What information in the video was false?
"your whole life is a lie" for a start. we're playing with semantics. a lot of things happen when you add salt to ice, and yes, melting is one of them.
Bruh, did you even watch the whole video?
@@lorenzo42p dude but your life IS a lie
I was looking this up for reasons of use in a cooler. It is nice to have a cooler really cold but the salted ice will melt first. Yes salt can make things colder but it seems short lived. In a cooler while the salt ice is completely melted into water. The other cooler with regular ice will still have ice in it; maintaining a colder state longer. So for longevity (in a cooler); regular ice for me.
The same thing that happened to the glass with the ice and salt happens to a cocktail shaker(meaning it is cooled below freezing). So does alcohol have the same effect as sodium chloride on ice? if not the same is it similar? Or is it to do with the shaking of the ice and alcohol mixture? If it is to do with the shaking, that would be very counterintuitive but as shown in this video conventional ideas don't always apply.
No hate but you ised ice cream salt
Used*
XxHappygamerxX 9933 Go back and read your sentence. There's kind of a typo.
Rock salt is also sodium chloride
So?
XxHappygamerxX 9933 ice cream salt is commonly rock salt Not shaker grade salt
Use regular salt, it does melt ice
Nick Ice cream salt is still sodium chloride
use the stuff from the salt shaker on my kitchen table, not that chemical sodium chloride stuff, whatever that is. I've been lied to. next someone will be telling me there's chlorine in my salt shaker.
Thank you for doing both ferenheit and Celsius helped me out cause I'm in Canada we use Celsius
Really enjoy your video's with my kids, Also! I'm ready to give a 45 minute lecture on the equilibrium and thermodynamics of salt and water...
Nice video :)
"Nice video" for common core "education" besides flat earth video.
When salt is put in contact to ice, Na+ ions stick to oxygen and Cl- to hydrogen, because water is polar and they break some hydrogen bonds that are the cause of ice to be solid. This is possible because ionic bonding is stronger than hydrogen bondings. When we heat ice it absorbs heat and the shaking of the molecules breaks some hydrogen bondings too and ice melts. So salt melts ice, but others prefer to say that water dissolves ice.
For a science account, you sure are avoiding the basic definition of what "melt" means and the fact that the salt isn't melting the ice, and that it's just preventing it from refreezing
Im confused and hungry
@@leafmanwithafryinpan oo!
@@leafmanwithafryinpan According the Cambridge dictionary melt is to turn from something solid into something soft or liquid, or to cause something to do this.
Sounds pretty dead on to me
the main purpose is to break it down and prevent the ice from sticking to the roads, providing a thin barrier (since salt retains heat better than ice). it also provides better grip on tires in icy conditions - notice how when you put salt on your walkway, it has little holes where they salt was? thats the general idea
so if it is -20 celsius outside and you put salt on an icy sidewalk it won't melt the ice? I get what you are saying about the salt lowering the freezing temperature of the water once the ice melts to prevent it from re freezing but if it is below freezing then the ice wouldn't melt in the first place, right? Please explain.
Salt doesn’t melt the ice it will make the ice’s melting point lower than 32 degrees Fahrenheit
james Mayer thus, making the ice liquifi by means of heat. Which is the exact definition of "melt"
*0 degrees Celsius
... making the ice _melt._ Because its temp is now above its melting point.
I KNEW IT
*I ALWAYS KNEW IT*
but if thomething is colder it means that it is absorbing more energy right, because it has to absorb the energy of the thermometer to cool it down. so i always thougt ice is either melting because it gets warmed up from the outside or the water itself has to take more energy from wormer places, wich feels cold. is this hypotheses also right or is it wrong or nobody knows if it is right because there are no experiments to test this???
You deserve so much more Views!!!
Would it be safe to say that salt dissolves ice?
+Gina Lola yes! Salt dissolves ice. But actually I do t care when people call it melting. I still call it melting too, but it’s neat to know the difference
Nope. Water dissolves the salt, the water is a solvent not a solute. And before you say "but its ice not water" ice always has a thin layer of liquid water on it up until extreme low temps (-40F if i remember correctly). This is what makes ice so slippery. The action lab guy has no idea what the fuck he is talking about (or at least is incredibly misinformed and generally stupid). Salt melts ice, because salt lowers its melting point, causing it not only to melt faster but to get colder. It's funny how at the end he talks about telling other people about the laws of thermodynamics as if he knows what he is talking about, which of course he absolutely does not.
YES!
Well, no, but yes. It pulls water from refreezing.
Gina Lola um no? it just lowers the water freezing point, high school chemistry. iirc Δt = molal * kb.
Seems like all you did was prove that salt DOES melt ice!
there's many smart comments here you can feel free to read if you're confused by this.
What would my day be without getting my mind blown by you yet again!
That sound track tho 😂🔥🔥🔥🔥🔥🔥🔥🔥
Migi’s theme vibe lol
@@goldentortoisebeetle9741 how tho the beat sounds nothing like anything from parasyt