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why density of ice is less than water? Answered


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aeray

7 years ago

Because water expands as it freezes.

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kelseymhaeray

Answer 7 years ago

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

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aeraykelseymh

Answer 7 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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kelseymhaeray

Answer 7 years ago

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

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aeraykelseymh

Answer 7 years ago

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

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kelseymhaeray

Answer 7 years ago

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

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Kiteman

7 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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KitemanJack A Lopez

Answer 7 years ago

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

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lemonie

7 years ago

Water is "funny stuff" - it's mostly down to hydrogen bonding, the answer is in there.

L

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orksecurity

7 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.