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Martin, Engineer
Category: General
Satisfied Customers: 4944
Experience:  i'm 41 and i never stopped studying and experimenting
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if heat rises why does ice float

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if heat rises why does ice float
Hello and welcome.

It have to do with density. In air the heated air expand so it is less dense than the surrounding air.

The same thing happen in water, hot water expend and become less dense than surrounding waters, so it start to go up.

Ice is particular as when it freeze from water it expend (most cold materials contract). This have to do to the molecular structure of the ice crystals. That is why you must not keep a glass bottle of water in a freezer at it mat break when the ice expend. So the less dense water in the form of ice float.

In the case of sea water, the salt get expelled when ice is forming and as fresh water is lighter than salty water it then float even more.
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