Water

Paul0o

Waarom drijft ijs op water? Oftewel, hoezo wordt de dichtheid van ijs lager als van water naar ijs overgaat?

anusthesist

Dat staat hier uitgelegd.

Klintersaas

Heb je zelf al eens gegoogeld?

An unusual property of ice frozen at atmospheric pressure is that the solid is approximately 9% less dense than liquid water. Ice is the only known non-metallic substance to expand when it freezes. The density of ice is 0.9167 g/cm³ at 0°C, whereas water has a density of 0.9998 g/cm³ at the same temperature. Liquid water is densest, essentially 1.00 g/cm³, at 4°C and becomes less dense as the water molecules begin to form the hexagonal crystals of ice as the freezing point is reached. This is due to hydrogen bonding dominating the intermolecular forces, which results in a packing of molecules that is less compact in the solid.

Bron: http://en.wikipedia.org/wiki/Ice

EDIT: Anusthesist was me voor.

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