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Why water at 4°C is most dense ?

Asked by anirbanbag81 14th October 2017, 8:06 PM
Answered by Expert
Answer:

In ice, the water molecules are in a crystal lattice that has a lot of empty space.

When the ice melts to liquid water, the structure collapses and the density of the liquid increases.

It's because of two opposing forces: thermal kinetic expansion and H-bonding.

The thermal properties are not enough to break all the h-bonds apart, but the h-bonds have not formed enough to widen the distance between water molecules to be as great as in ice which is why ice is lighter than water.

Answered by Expert 15th October 2017, 1:10 PM
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