The Melting Ice Problem!
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- Опубликовано: 27 сен 2024
- Take a glass of ice water, and wait for the ice to melt. Will the water level go up, go down, or stay the same? Understand the buoyant force and you'll understand the answer! Get the notes for free here: courses.physic...
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Many people seemed to confused why ice metling causes sea lvl inc when the lvl shouldn't inc so lemme explain.
This demonstration is correct when we talk about ice melting when placed in normal water with 0 impurities. Your usual H20
But the oceans are actually not pure, they dissolved with thousands of tons of salt and minerals, thus making them equivalent to a liquid with higher density than water.
I hope he makes video on this too but, when ice melts in a higher density liquid rather than water, the net lvl water actually rises rather than staying same.
Tldr, ocean water is denser than regular water thats why ice melting inc the water lvl rathern than staying same.
Awesome channel!
I really liked the idea of removing the ice while leaving a space where it was, and then filling the space with the melt water from the original ice cube. The answer was obvious after that!
It begs the question as to why global warming increases water height. Of course though, a lot of ice is on land
when it comes to global warming, never worry about the ice on water but the one on land.
Yes, Plymouth Rock remains
Thermal expansion together with landice are the biggest contributers
When ocean ice melts due to global warming, assuming that the ice is in the same physical conditions like in this video, then it wouldn't make sea levels rise. However, when that happens, we should also look at the warming of the sea in other areas of the world. As temperature goes up, seawater gets less dense, which means the volume of seawater goes up, hence sea levels will rise.
This is still not mentioning ice on the ground which, when melted, can add to the seawater volume/rising sea level.
Chemists slamming their heads into the desk...."But the hydrogen bonds?!?!....It's less dense" My physics professor asked us this question and it tripped up all of the chemistry and biochemistry majors.
Thanks for the explanation!!
Helped me a lot ❤❤❤
Surprisingly, this was in our exam back then. I was the only one able to answer correctly, means I have 1 point higher than everyone else in the room making me the top scorer. It's about density, mass, volume and water displacement. Not the expanding of the gaps of the atoms when liquified. Also, the sea is composed of salt not freshwater.
Therefore, we can predict that the volume of ice 10% greater than that of the same weight of water.
I got it right!!
OK, but let's say the ice cube is completely submerged and hold in place (for example by holding it in your hands). Does the water level then sink because the ice cube displaces more volume than it can fill?
Thank you for explaining!! Very clear
Clear. Thank you.
Thanks Dav!
Ice bergs and glaciers are fresh water. Sea water is salt water. It is more dense. Less dense objects float higher. What does this mean about the volume of ice bergs in sea water?
Noooo....my whole life were wrong. Anyway thank you for the enlightenment.
makes si much sense
Wait a second, if water level doesn't change, then why do we read everywhere that ocean's level is rising when icebergs melt?
Because of the ice already above sea level on land will melt and go into oceans
I agree with you here but wonder how NASA says otherwise here🤔:
sealevel.nasa.gov/news/261/melting-ocean-ice-affects-sea-level-unlike-ice-cubes-in-a-glass/#:~:text=A%20floating%20object%2C%20like%20an,was%20ice%2C%20raising%20sea%20level.
They are saying rules are different when the iceberg is freshwater melting into ocean salt water. They say the sea levels do rise in this case and even show a diagram to help visualize this. I agree with this video and your comment but confused about NASAs article.
Almost right I believe. This assumes that the water is at zero degrees celsius both before and after the ice melts. If the water is warmer then it will be cooled by the ice cube and will very slightly shrink in volume (as water does say between 5 degrees and zero. Equally if the water is at zero but over the period of the ice melting it absorbs energy from its environment then it could warm (although around the ice cube this will not happen) but this will be a slight increase in volume hence the water level would rise ever so slightly.
I believe water is densest at 4C. So as it cools below this temperature it will increase in volume and the water level will rise.
@@rodbhar6522 Liquid water is densest at +4C but below about -10 it becomes denser still.
A lot of people uses this as an example that the ocean levels won't rise with the melting ice. But from what i understand most of the ice melting is on land, so if the ice is melting from somewhere else into the glass will it not rise?
Don't try to tell them logical things.
If they firmly believe that the shadow people are lying to them about goddamn global warming and the earth's shape, let them be, this makes them feel special.
The principle can only be applied to closed systems. Oceans are open systems. So ice sheets melting in water also increase the volume
in this experiment they are also not accounting for evaporation loss in the glass during the time, which would just equate to unaccounted water. In the real world, this water loss would be additional water circulating in rain cycles would it not?
How do we know the ice is on land most of it is in the water
The ice melt constantly and ice burgs fall in the water with that much ice why doesn't the water rise
I have a question, does the ice displace water downwards?
can you do a calculation of the estimated time it will take to the block of ice to be melt. Using some themordynamics principles
water in fluid above 0 degree
water in ice below 0 Degree
you can do just do the math the rest is yours
If the object floating is not ice, will the water level then rise?
The weight is already in the water
Insufficient information as it fails to account for the variation in water volume based on it's temperature. If the water temperature ends up closer to 4C once equilibrium is achieved than it was at the start, then likely the water level will go down, slightly, but to first order, the answer given is correct
How pendantic. Do you have any idea how little difference that makes?
Well, if we go this route, then the container will also cool down and shrink a bit causing the water level to go up, slightly.
@@Celastrous it would make a difference at scale. But then again, other factors such as evaporation would too.
C obviously
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Amogus
except the part of ice buoyant in AIR affects its weight.
Do not forget the air trapped in the ice and the evaporation over time
Right but obviously looking into sealevels rising this isnt the test .add a funnel full of ice melt into the cup of water .
with this logic, explain the ice caps melting being the cause of raising sea levels.
That’s an excellent question! It’s not the ice caps that exist on water that is the concern. It’s the ice caps that exist on land that will cause rising sea levels.
Ok I will explain
When the ice melts in a perfectly clear water, the water level remains same. For sure
But the ocean Is not clear water, it has tons and tons of minerals and salts dissolved in it, thus making it denser than your usual clear water. So rather than treating ocean water as normal h2o, treat it like a liquid with higher density.
Soo when ice melts in a liquid of higher density the level actual rises
When ocean ice melts due to global warming, assuming that the ice is in the same physical conditions like in this video, then it wouldn't make sea levels rise. However, when that happens, we should also look at the warming of the sea in other areas of the world. As temperature goes up, seawater gets less dense, which means the volume of seawater goes up, hence sea levels will rise.
This is still not mentioning ice on the ground which, when melted, can add to the seawater volume/rising sea level.
Sort of. The ice will melt and technically still have the same amount of the ice and water