Does Shaking Soda Really Increase Pressure? | Experiment
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- Опубликовано: 1 июн 2024
- This videos shows that when you shake a soda bottle the pressure does not actually increase. The reason that this occurs is because when the soda bottle is at equilibrium, physical agitation cannot change how much CO2 is in the headspace or the liquid. It remains a constant. This is only true however, if the bottle truly is at equilibrium. In my experiment, to get it to work properly, the bottle had to sit for about 4 hours after I opened it. If the bottle is not at equilibrium then the pressure will likely increase when you shake it because the shaking increases the speed at which the bottle comes to equilibrium.
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Here's an experiment to try.
Pour out a third the bottle of soda. Collapse the bottle slightly and cap it. Now the bottle should have a dent. Since the bottle is trying to get back to its natural state I would assume the air pressure in the bottle should be very low.
Now shake the bottle. If the air pressure remains the dent should remain.
But it doesn't. What force causes the bottle to pop back into shape if not air pressure.
When co2 is dissolved into a liquid it is no longer a gas. And we all should remember that gasses expand to fill a container. Liquids do not. So when you shake the bottle the solute (co2) is released from the liquid and exists in a gaseous state taking up more space and causing more pressure.
I know this is an older video but... Hi! Aerospace engineer here. If the inside of your bottle is gaged at 30.5 psi (45.2 psi true pressure) after you shake it, that means that it is at more than 3 times sea level atmospheric pressure (14.7 psi). Considering you vented the bottle before each pressure reading in a row, the gage should read 0 psi (this is due to how gages measure pressure). You shake it each time which repressurizes the container. Please try to avoid spreading misinformation.
When i measure my tire pressure, it doesn't empty the tire. What is different about this? If that wasn't the point, then what exactly is the misinformation? (Not an engineer at all, just a confused and curious person)
Randomly stumbled upon this, didn't realize I follow your main channel until halfway in. It's nice to see that you seem happier now.
(:
this is my kingdom come, this is my kingdom come.
what I understand is the following: when the bottle is left aside, the CO2 is in the "empty" space we see between the cap and the liquid, which is compressed inside the can or bottle. Once you open all the CO2 quickly goes out to the air because of the pressure difference. However, when you shake the bottle, many of that CO2 is mixed up in small bubbles as you say inside the liquid, so when you open the bottle short after those bubbles will want to get out too but soda will be in its way, causing the explosion.
The same effect happens when you dive so that's why you need to surface up slowly in order for the bubbles to come out slowly out of your body instead of quickly which can damage internal tissues.
when you shake it, you make more nucleation sites for the gas to come out of solution, disrupting the equilibrium. It will settle back again after about 2 minutes or so as the gas dissolves back in. its the same principle as to why dropping a mentos in soda makes it erupt. try using an actual pressure gauge with pipe fittings instead of that cheap tire gauge.
Nope.
You disrupted the equilibrium when you opened the bottle initially. Once that seal was broken, no ADDITIONAL pressure was going to be created because the amount of carbon wasn't going to increase in the bottle's contents; they'd only decrease.
Had there been a gauge installed at the bottling company and THEN done the test with that same gauge, your theory would yield the opposite results.
You might want to try a different method that doesn't involve breaking the seal in order to maintain the initial equilibrium, and then shaking the bottle, not AFTER opening the bottle.
The simple proof that this is the case is how a bottle becomes hard from shaking it before opening it. It's a principle they rely on at the bottler.
No thermodynamics needed.
watch the Veritasium video about pressure.
So.. it all works because it's already pressurized to ~2atm (30psi). You mentioned the small bubbles that expand not do to their pressure but the lowered pressure above? Pressure is only relative and the tiny bubbles then would be under pressure to the air above them, and when you open the lid and expose the top causing the decrease in pressure, doesn't that have to happen because the atmosphere is less pressure than the bubbles in the bottle, thus the bottle is under pressure.
Can you please revise the experiment such that:
1. put modified cap on new bottle.
2. allow bottle to settle overnight at room temperature
3. measure the internal pressure
4. shake bottle vigorously
5. measure the internal pressure
6. compare the two readings
7. repeat experiment for different kinds of soda
very cool video! i'm gonna get me a frothy soda now
Nice!
Every Kind Of Scientist you are so awesome I hope is I a new subscriber will help you handle grow even bigger and btw what is your insta
When the CO2 escapes into the area above the bottle. That causes expanding in the plastic. That means that there is pressure. It can relax and reform into the liquid, but that takes time. For reference, use a two liter bottle. You will get the same output force, but the plastic will still expand enough to become hard.
When I grab an aluminum can of Doctor Pepper, I can easily squeeze it a good quarter inch, however once I shake it, it becomes as hard as a rock. Now explain that to me. If the pressure stays the same how can it go from being very soft to nearly impossible to squeeze?
I'm not sure about that. All I know is that according to thermodynamics, the pressure should not increase. And in this experiment I did, it also did not increase no matter how much I shook it. So take from it what you will. You have to keep in mind that cans conduct heat a lot better than plastic bottles so it may be that the pressure increased due to holding it in your hand form the heat. Try it with a room temperature can of soda and see if you feel it get harder, this way you can negate the temperature change.
Will do.
that happens with plastic bottles as well. When you buy them you can squeeze them, and if you shake them, you can't. I'm not very sure this video is legit. If the bottle becomes harder, the only reason that seems to make sense is that the internal pressure is raised. But then again, I don't have a very good knowledge of physics. I'm just talking about the phenomena I observe, and about the explanation that seems most logic to me with the little knowledge I have and with a bit of logical thinking.
It has to be done with bottles that are at room temperature. If they are cold, they warm up and that raises the temperature. In my experience, if I go to the store with 2 liter bottles on the shelf and shake them, I can't tell a difference. Next time you are at the store try it with the room temperature soda and let me know what you think.
Thoughtyness agree
Question - I took a soda bottle, opened it and poured a little bit out. I squeezed the upper part of the plastic bottle, closed it firmly and let it sit for a whole day to get to equilibrium. Then, I shook the bottle real good - and it straightened right away and wasn't wrinkly anymore - Hasn't the pressure increased??
Very cool! I would have lost if somebody had the nerve to bet me the pressure in a (unopened) soda bottle does not increase by shaking 🤟
"Please tell me how you can increase pressure in a system that is already at equilibrium?" Shaking it causes it to no longer be in equilibrium.
If a system at equilibrium begins to increase in pressure then it sure was not at equilibrium to begin with.
1 reason can be that when you shake it so its soda particle has much energy to overcomethat tension force and its pressure increases and when you just open the tap the soda appear to be come out and one thing when you just open the tap for some time the CO2comes out and then the taste become akward or stale
Dude you are correct if you are talking about taking the top off first but if you measure the pressure in that same bottle before you take the top off it will have gained pressure because it is pressurized with CO2 as well to keep the soda from going flat.
it would only go flat if you left the top off dumbass
You say frothy funny. I could listen to you saying that all day
Does shaking soda really increase the pressure? : "Now since I opened to bottle and released the pressure, I'm now going to give it a good shake. This will release some of the CO2 into the headspace here, and we pressurize it." at 1:25
The reason it will re-pressurize then is because I had just opened it and threw it out of equilibrium. So it will try to get back to equilibrium, and shaking it just makes that go faster. But in a soda that hasn't been opened, or that hasn't been opened in a long time, it is already at equilibrium, so shaking it does nothing!
explain to me if i squeeze the bottle to where there is no headspace its just soda and shake it it goes back to normal (so the headspace is fulled with Co2) also when you put the lid on you said "Now since I opened to bottle and released the pressure, I'm now going to give it a good shake. This will release some of the CO2 into the headspace here, and re-pressurize it." now why would you say that if the pressure does not increase.
i dont know much about physics but im pretty sure the internal pressure of the bottle is increasing correct me if im wrong
i know that you could only increase the pressure inside the bottle until it hits equilibrium but you have to think about it shaking a bottle when its just been opened the pressure does increase.
The pressure does not increase on an unopened bottle. Meaning it cannot increase past the initial pressure of the bottle. If you open it and release the pressure then of course the pressure will increase since the system is no longer at equilibrium
If pressure doesnt increase why does the soda bottle harden when shaken?
A year has passed, no answers to this excellent question. I’d like to understand as well.
@@smarthandsomeguy he answers this at 3:50
@@ImeanFFS thank you!
0:08 This video aged well
this is vague. After the shaking ,the pressure goes up of course. Otherwise, why the bottle becomes harder? But this pressure increase is not measurable by the cheap $10 digital gauge. The gauge error itself is more than the pressure increased. The same as your blowing a pressure gauge directly, it won't read. But you did add pressure in it.
From my understanding is that the most obvious proof to no pressure is that the bottle doesn't visually show pressure building up. This is just a guess but I want to say the when you shale the bottle the momentum trigger the carbon infused in the soda become excited and more readily leave the liquid back into gas but due to their being no space to go it remains stuck in the liquid. So when you open the bottle the carbon rapidly evaporates into the air causing the bubbling
Modeling the CO2 inside, if the volume increases shouldn’t the pressure decrease according to PV=nRT?
There IS pressure, they teach you this in dive school
Mug moment
but how come it sometimes explode when you shake it but keep the lid on?
*COCA COLA ESPUMA!*
but, when i shake a can of coke, it actually pops the bottom out
hey a lady wants you to do this
Super Beth
Have you checked the cool whip ingredients? Great for science experiments, human consumption, not so much.
Duh it went flat because you shook it then left it over night
You can only shake a bottle of soda two or three times before it all the gas escapes
Dang the background track of this song sounds like a transposed version of Mother We Share by Chvrvhes
this is oddly nostalgic
Honest question, not trying to be smart-alek-y. I understand what the science for bottles off the shelf but does decrease in energy by chilling the bottle prior affect the pressure?
girunit94 changing the temperature affects it a lot. When the soda is warmer it will have a higher pressure, when it's colder it will have a lower pressure.
So then I think that may be what is confusing the commenters. Cause in theory the cold would put the co2 in a state of low energy; shaking the bottle providing energy to the co2 thereby rasing the pressure. But course because of your video I now understand equilibrium better. :)
Yeah I should have made it more clear that if the temperature changes the pressure will of course increase. My main point of this video is that most of the perceived "pressure increase" is just due to the fact that you made small bubbles that expand when you open it causing it to overflow, not necessarily due to higher pressure.
Wrong again, what happens when you shake it is you release the CO2 from solution which increases the amount of gas, but the volume is limited to the volume of the bottle so the pressure does in fact increase. But when you open the bottle the pressure is released allowing the small bubbles to expand in volume, since the volume is no longer limited to the size of the bottle.
Wow... that sucked
He literally used a hole inner tube just for the valve, coulda just bought a tire valve bud🤣
what does "frothy"(?) means?
(i'm not english)
It might keep the foam or the fizz and it won’t go away kind of like a beer
Now do the same with manometer attached to the bottle
I'm thirsty.
Short answer:
Yes
*WHY THIS EXPERIMENT IS A FAILURE*
1) When you open the bottle, it resets the pressure to zero. Then you shake the bottle then measure 30.5 psi the next day.
you shake it again, measure 30.5 psi again THEN you shake it again and measure 30.0 psi! So yes, shaking a bottle really does increase pressure.
2) Carbinated beverages are at CO2 Equilibrium at around 110psi gauge pressure. So not only does opening the bottle change the equilibrium concentration levels, the unopened bottles themselves, even though filled with CO2, are still far from equilibrium. That is why you get those pressure changes.
I guess you could argue that you reset the equilibrium point to 30.5 psi, but I wouldn't consider that a "soda" anymore. The change in pressure *IS* what causes drinks to explode.
*Shakes it up*
*Measures pressure for baseline*
*Shakes again*
*Measures pressure again*
No way?!? Same pressure. Who would have thought??
Come on, I know you're smarter than that.
Or maybe you're not....
I'm not sure what you mean. I waited an entire night for it to get back to equilibrium after I put the lid on and shook it (this is more than enough time to get to equilibrium). Then after that was done, I shook it up and it stayed the same pressure no matter how much I shook it. Now, remember that whenever you shake something you increase the temperature slightly, so if I were to continue shaking it a lot the soda would heat up, causing a pressure increase.
Adam deli I can tell you have never done this for yourself, it actually takes quite a long time to get to equilibrium. The initial shaking does help, but it did not get back up to the original pressure until at least a few hours. Before you respond with any more of your assumptions please make your own video and show me the results.
You didn't measure the pressure right off the bat, before shaking and allowing it to equalize. Opening it the first time released a substantial amount of CO2. When soda is bottled, the CO2 is entering the liquid at extremely high pressure and then it is capped. Any liquid can be supersaturated if either head or pressure is added. By opening it once, you removed the supersaturated CO2 and then of course, there will be an equilibrium. You can easily tell differences in pressure of soda bottles by simply pressing on the plastic bottle. Had you not opened it first before measuring pressure, you would have found that the pressure is indeed greater.
Actually, as long as there is CO2 dissololved in the liquid, the pressure will always re-equilibrate to the same pressure it was at. Yes, when you open it you let out the CO2 in the headspace, but then once it is closed the CO2 from the liquid will re-pressurize the headspace to the initial pressure. This will happen as long as there is adequate amount CO2 (and carbonic acid) in the liquid, which there will be especially after you just open a soda. In fact, not shown in this video I checked the pressure several time over the course of days and opening the bottle several times. It always comes back to the same pressure. This is what I would expect thermodynamically also.
To do this properly, you really need a can that's manufactured with the valve already in place. Any child can squeeze a can or bottle of soda, before and then after shaking, and tell that there is something wrong with your experiment. In other words, by opening the can or bottle first, you've already changed conditions inside the can or bottle.
I understand you way more than my math/science teacher
Does no one notice that the thumbnail is edited? It looks like he took an image of peanut butter and put it over the root beer...
There is a Twist the twist is that the pop isn’t fizzy
Have you ever had an unopened can that was already flat? I have a suspicion that this happens when the can is kept in a warm place for too long. The heat would change the equilibrium point and increase the pressure in the head space. Then very tiny holes could cause the gas to leak out. I assume the holes are near the top so keeping a soda upside down in a hot place should decrease the effect. I haven't done any experiments to verify any of this though.
Pet plastic is not impermeable to co2, over time it will leech out. Heat increase molecular vibrations, making the molecules take up more space and move faster...If you are trying to throw a ping pong ball through a 2" hole in a 10x10 wall and you have a 1% chance of making the throw then out of 100 attempts you will throw 1 ball through the hole. If you pretend heat has a positive correlation with the rate at which you throw, you will throw more balls through the hole the hotter it is, even though you still only have a 1% chance of throwing the ball through the hole.
I came from The King Of Random's video, didn't know that you have a second channel!
This was seriously so interesting! I'm excited to spread this as a fun fact like "did you know..." haha. Great job, you should be a professor :)
It's wrong.....
if you open it it won't work
I don’t know what to say why
Knowledge XD
ROOBEER NOOOOOOO
Great little video. You are absolutely correct in all of your statements. Mad props for thinking about using the inner tube's rubber base of the Schraeder valve as the seal in the cap! Genius! I've done this before, but by epoxying a Schraeder bulkhead valve into the cap. Your idea is way more clever--I was kicking myself wondering why I didn't think of that!
How many psi does a coke have? Coca-cola
So I just opened my Pepsi and took a few drinks then I squeezed it to let the soda go to the opening and I put the cap back on but I shook it and it filled the bottle back up instead of staying squeezed
Man you can shake a brand new bottle of pop and feel the bottle get way tighter. Clearly the pressure has increased. The energy you put into the bottle by shaking it is what increases the pressure. Once the C02 is dissolved it doesn't require high pressure to remain dissolved. Adding energy though increases the pressure needed to keep the CO2 dissolved. Has nothing to do with equilibrium
AIR PRESSURE DOES NOT CHANGE IN BOTTLES! it’s the equilibrium of the gas being forced to the top of the bottle and the liquid staying still.
this guy has taught literally everything wrong and he’s so unreliable
wow l loved it! that was very interesting! who knew and loved that you can measure the pressure that way!
ayyy, this is completely wrong
this is clearly rubbish, get a fresh un opened bottle of soda and give it a squeeze... it gives a little right.... now shake it and squeeze mush harder to squeeze right. so internal pressure has increased... yeah if we leave it long enough the gas will be reabsorbed but in the short term the pressure did in fact increase.
In 2021 5 yrs old osm
Explain why the can/bottle feels hard as if there's pressure in it after shaking, smart one.
Hello smart one...If you want to learn I will reply, but if you want to insult then you can move on...Let me tell you this. Go to the store, go to the soda isle and grab a two liter bottle of soda off the shelf. Feel how hard it feels. Then shake it and tell me if you feel a difference. You won't. Now if you were to open it, then you would release the pressure and it would feel soft, then if you shook it, it would quickly release CO2 from the liquid and re-pressurize and feel hard. Eventually after a long time it would feel the same hardness as the original un-opened soda bottle.
Austin Kemmer but... I feel a difference
"Every Kind of Scientist" does that mean you Identify as a scientist? Social Justice Scientist? Faux Scientist?
If you release the CO2 from the liquid, indeed the pressure will increase. In fact, you demonstrated this quite accurately in your video. You opened he Sprite bottle (Pressure = 0). Then shook it and let it sit over night. Then you shook it again for whatever reason, and took a pressure measurement. You then hear the pressurized gas escape when you apply the pressure gauge 2:18 which then gives a reading of 30.5 psi. Obviously this is gauge pressure, but even if it was total pressure, you'd only be reading 14.7 psi at atm pressure. So where did this pressure come from genius?
Bs
Does shaking a soda bottle increase pressure? No shit. Does shaking a soda bottle increase pressure if you've allowed the dissolved co2 to escape and then shake the bottle? Of course not, the increase in pressure comes from agitating the co2 out of the solution. This video is dumb and the title is misleading, it's akin to asking if a rocket will fly if you don't use propellant.
lame
Equilibrium is like yin and yang
4:10 WRONG! You don't NEED to drink your soda. Nobody needs to drink soda. It's bad for your health. Also, thanks for the experiment! :)
the # of people in the comments who can't wrap their head around this is pretty funny
Yeah, at equallibrium....
it doesn't work with sprite. only soda with more surger
I KNEW IT ALL THE TIME BUT NOBODY BELIEVED ME!!11!1
That's a junk experiment, and you sound like a funeral director. You released the pressure from the factory, then put your gage in, then shook it and measured the next day, then shook it again and got the same result.... Hello duhh.. you already shook the damn bottle! Letting it "equilibrium" (lmfao) overnight doesn't let it loose any pressure from shaking it... Please take this video down so people don't actually believe it.... Go to the store and grab a bottle or can of pop and try to squeeze it and see how eazy it is to squeeze, then shake it and you will just by feel that the pressure is much greater than before... My guess is there isn't any, or maybe 5psi from the factory (only the factory knows for sure) and when it gets shaken, the maximum psi is 30.5 as you see. And that's why it explodes after it's opened after being shaken or dropped
You obviously have no idea what you’re talking about
Dumb and poorly made experiment. I do understand what you mean and you're right. But the title's bit click baity.
This experiment is flawed, sorry.