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# Speakers Corner

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# Why Does Ice Float

woodchip

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Water reaches its maximum density at 4°C (40°F). As it cools further and freezes into ice, it actually becomes less dense. On the other hand, most substances are most dense in their solid (frozen) state than in their liquid state. Water is different because of hydrogen bonding. So how did that come about. as it lets fish and other living thing survive under it

bumpkin

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Lotvic, only if you remove the water.

fourm member

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'it lets fish and other living thing survive under it'

If ice were denser than water there wouldn't be a problem for fish.

There wouldn't be any fish. Evolution would have taken a different direction.

morddwyd

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That's why I was always failing exams. I would have given a two word answer "Specific gravity".

I would then be told that I should have explained specific gravity, and I would point out that's not what I was asked, and I'd lose the few marks I had been given anyway!

lotvic

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bumpkin, lol (you knew darned well I meant the anomaly - not the ice, or the fish or the antifreeze, etc etc :D )

So (as per opening post) it's all to do with the density, of course, got it. Now what shall I do with it?

Aitchbee

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Surface Tension has a part to play:-

http://www.bbc.co.uk/sport/0/winter-sports/21820728

Bing.alau

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I always thought that on a pond when the water froze in to ice, that there would be a slight space between the surface of the water and the ice. Also that there would be a space around the edge of the pond.

wee eddie

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The air under the Ice is caused by the same phenomenon as a Gold Fish's bubbles!

This posting has been made before the watershed!

WhiteTruckMan

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Soooo......If you melt sea ice do you get fresh water or brine?

WTM

Quickbeam

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You get melted sea water...

Quickbeam

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And thinking back to science lessons 40 years or more ago, anything in suspension in a liquid that is frozen, will remain in suspension.

Ice bergs are lumps of glassier flow that break off and are made from fresh water fallen as rain or snow, so they remain fresh water as that was the pre-frozen state.