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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

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carver

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WTM melted sea ice can be drunk as over time the brine is almost gone, as sea ice freezes it start to lose the salt content and as it ages more is lost.

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carver

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Sorry should have posted a link enter link description here to a very good short bit of video showing how it happens.

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Quickbeam

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That's interesting carver, I remember doing the freezing water and boiling water temperature differences with varying salt levels at school, but we still ended up with salt water when it returned to room temperature!

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carver

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Quickbeam I can remember doing a host of experiments at school and I would hazard a guess that nearly 30% are so out dated now that nearly every thing I learned about them is wrong.

But you can only be taught what present day knowledge can tell you.

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Quickbeam

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carver In fairness the same school experiment, done with the time limit of one lesson period will bring in the same result now, and I think a lump of frozen North Sea ice from the beach in Northumbria will make for a very salty cocktail indeed.

The link video is a fascinating example of what nature, which has no time limit and unlimited extreme conditions, can do beyond a comprehensive school lab's apparatus!

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michaelw

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" 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"

That's how Harry Houdini managed his jumping into a frozen river trick. He survived for a long duration beneath the ice by breathing the air trapped between the ice and water (about 1 inch I think).

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Bing.alau

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michaelw. Thanks for confirming what I remembered from somewhere in the dim and distant past. I suppose it also provides oxygen for the life in the water.

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john bunyan

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A link for pond owners (no need to leave a hole in the ice) Pond research

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wiz-king

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Good job ice floats - just think of how many ship would have been Titaniced if icebergs sank and you could not see them.

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Aitchbee

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Seven eighths of icebergs are unseen 'n' underwater - and therefore not floating in the normal sense of floating.

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