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why density of ice is less than water? Answered


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aeray
aeray

10 years ago

Because water expands as it freezes.

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kelseymh
kelseymh

Answer 10 years ago

Tsk, tsk. That just begs the question. Why should liquid water behave differently than nearly all other materials?

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aeray
aeray

Answer 10 years ago

I like keeping it short and simple ;) Oh- the "tsk, tsk" made me snort coffee out of my nose. Thanks.

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kelseymh
kelseymh

Answer 10 years ago

:-D Did the coffee expand or contract as it cooled? ;->

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aeray
aeray

Answer 10 years ago

I believe most of it was vaporized, and then the remainder was coughed out back into the mug.

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kelseymh
kelseymh

Answer 10 years ago

Mmmmmm....second-hand coffee. Sounds delightful ;-P

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steveastrouk
steveastrouk

Answer 10 years ago

...and slightly thickened.....

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Kiteman
Kiteman

10 years ago

In liquid water, the molecules are in random disarray.

As they cool and slow, the weak electrical forces between the different parts of the V-shaped molecule become more important, and the molecules arrange with the oxygen atoms of one molecule close to a hydrogen of another.

This forces the molecules to "stack" point-of-V to end-of-V, which is a less space-saving arrangement, so the solid ice takes up more space than expected.

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Kiteman
Kiteman

Answer 10 years ago

Hah, I gave my answer without resorting to the innertubes.

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orksecurity
orksecurity

10 years ago

The space between the water molecules in crystal form is greater than in liquid form. This is also, of course, why water expands when it freezes.

If you want to know why it's greater for water, unlike many other substances, you need to look at exactly how the molecules settle into the crystals.