Does Pressure Melt Ice?

Does Pressure Melt Ice?

I’m gonna try to demonstrate something called regelation. Which is where you provide a pressure onto ice and that turns it into water but after that pressure is removed it freezes again So, in order to demonstrate this I’ve taken apart the high E string from my guitar. I chose the E string because it’s thinner than a G string and that’s important. And I’ve weighted it with these two bottles of water. When I apply the string across the ice we should see the wire start to cut through the ice And perform the regelation of the ice. where we’ll see if it works because we are outside in Sydney and it’s warmer than 0°C obviously. All right, it’s past 3 A.M. but the experiment has been a success I passed this wire through this giant block of ice And it ‘s still a solid block. You can actually see the point where the wire went through, here. So, we pretty clearly demonstrated regelation. The idea that you can compress the ice, turn it into water and then when that pressure is gone it solidifies again as ice. Pretty cool stuff.

100 thoughts on “Does Pressure Melt Ice?”

  1. I know this video is old but I have a question. If we put water in vaccum it starts to boil is it possible to freeze it with pressure? Or is it a wrong question?

  2. Is this how that cola slush trick works where you shake the bottle to produce a high pressure then freeze it and it’s still a liquid when you take it out of the freezer, and only becomes solid when you open the bottle and release the pressure?

  3. I noticed this when I was young, you can squeeze an icecube really hard and it starts to drip a fair bit, and it can't refreeze if it all runs off lol

  4. anyone ever get that feeling from the video that he used to have a slight australian accent that isnt there anymore

  5. Is this why when freezing a bottle of water it can sometimes be taken out as a liquid and then upon squeezing the bottle it very quickly freezes? The pressure created from the water expanding as it freezes regelates it and a final squeeze and the reduction of pressure after the squeeze causes it to freeze before my eyes?

    The answer to this phenomenon would make a great video.

    Thanks for posting interesting videos that answers questions I've never asked myself and often leave me wondering more. 👍

  6. Should have used a material for the string with a lower termal conductivity than air. Because this way we don't know if the pressure Is melting the ice or the fact that the ice close to the string Is getting more heat…

  7. Theres a difference between setting a whole block under pressure and completely melting it, then removing the pressure and having it freeze again – compared to slicing through a block with a wire and having the surrounding ice freezing the water to ice again…. just saying.

  8. The experimant as you did it doesn't proove regelation. The string may be conducting heat from the room to the ice and melt it.
    To proove regelation you need to repeat this experiment at a temperature below 0 °C

  9. It may have been Bette to demonstrate it with a weight that is also below freezing so that it rules out any question of heat conductivity by the wire

  10. I would not assume that pressure was the only contributing factor here. That guitar string may be conducting thermal heat and it may pick up subtle sounds waves and even ulf. So I would say that pressure, temperature conductivity, and perhaps minor vibration were the cause. If you want to prove that pressure melts ices then use something with less conductivity or more similar to the ice itself. This experiment was not entirely useful for that reason.

  11. not an accurate experiment, since water on the surface (where the cut was) surrounded by the ice, which cools down it to the point where it again became ice.
    So hard to say is it pressure release effect or just heat exchange.

  12. No you did not demonstrate what you said. Too many variables heat in stroing cold from remaining ice. There is clearly a cut. Any ice will merge back together may be true but not demonstrated here.

  13. ummmm what about the temperature variance of the exposed wire? The wire closest to the edge will transfer heat to the outside edge to start the process. Not saying what you did isnt correct but it doesn't take a lot of heat to melt ice.

  14. this doesnt prove anything tbh…
    it might also be that the ice is just cold enough to refreeze the water after the cut and also thatthe string warms up by enviromental warmth.
    this proof seems flawed to me

  15. I know the string is pretty thin, but it still has some heat conductivity. This might not be the best set up. Maybe fishing wire would show better.

  16. one thing I don't understand. How are we sure that the sorrounding ice isn't simply re-freezing the water? How do we know it's the release of pressure?

  17. Well that was rather short. I was expecting you to challenge the idea and go into a mindblowing explanation why this commonly held belief is wrong, as you do.

  18. kkkk vídeo merda, tira isso do ar, ta ensinando burrice ao jovens, se vc por mais pressão no gelo ele simplesmente vai ficar mais duro, se vc tirar a pressão ele vai virar água, bota essa merda numa camâra a vácuo e faz a pressão dela ser menor q a pressão atmosférica pra gente ver a realidade

  19. This seems like exactly what you would expect. The ice melts a bit under the string and then the water freezes again because it's really cold and in contact with ice.

  20. here's a fun experiment you can try. Take a 20 ounce plastic bottle of soda(unopened) and place it into your freezer for 90-120 minutes. if your timing is right, it will still be in liquid form with no apparent freezing/ice formation noticeable. Remove the cap and watch as the soda flash freezes before your eyes. When you remove the cap, listen for the sound of excess carbon dioxide rushing out as it is released from the sealed container. that sound will signal a sudden drop in the bottles internal pressure which will then cause the liquid soda to instantly crystallize into a slushy semi solid mass so that you'll now have to squeeze the bottle to get the stuff out.

  21. Is the ice cutting due to pressure or transfer of heat through the string? Also, the water at the cut might be freezing again due to the contact of ice around it.

  22. isnt that like wire acts as heat exhanger and just takes more heat from atmosphere than ice would? then when it passes heat would be dicipated back to the ice resolidyfying the water, imo you should try it in freezer

  23. This isn't regelation it's the thermal conductivity of the wire heating the ice, and the ice refreezing after the wire has passed due to contact with ice.

  24. This is a unique characteristic of the water coming out from its hydrogen bond, which causes H2O molecules to form a kind of hexagonal shape when it is in solid-state. This makes the solid state of H2O, the ice, less dense than the liquid state of H2O, the water, unlike other materials because there is vacant space inside the hexagon of the frozen H2O; general material's density is higher when it is in solid state. (if the ice were more dense than water, there would be no iceberg floating around the two polar regions).
    And, as pressure increases, density also increases, regardless of one's state: solid, liquid, and gas. Same for the water. As pressure is exerted on the ice, its density also increases, and the most dense condition of H2O is achieved when it is in liquid state, the water (the pressure breaks the hexagonal shape of H2O).

  25. Wait, why does pressure do that again? I know that lower pressure makes things less solid and more towards gas, just like boiling water, so now I'm confused. Why would more pressure do the same thing?

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