/sci/ - Science & Math

Probably a stupid question, non-/sci/entist here Anonymous Sun Nov 27 13:43:40 2011 No.4073913 [View]
File: 368 KB, 1600x1200, ice.jpg [View same] [iqdb] [saucenao] [google]

I know that water expands when it freezes to form ice, but I have two questions. The first is quite simply "Why?" What is it about water that makes it expand when it's cold; am I right in thinking nothing else does this?
Secondly, as ice floats on water, this implies that ice is lighter than water? Is this just because it's expanded and so has a larger surface area? Or does it actually lose mass?
Sorry for my stupidity.

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