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Why does the density of a liquid is vary with temperature?
- vishal dhoke (age 21)
indian institute on technology, mumbai
The hotter something is, the more the molecules or atoms jiggle around.
Usually, when the molecules jiggle more they don't make as good contact
and therefore use up more space. As a result, the density goes down as
they get hotter. In some cases, the cold molecules settle into a
network that occupies a lot of space. Jiggling it then lets the
molecules get closer. That happens to water just above the freezing
point, where its density goes up as it's heated.
(republished on 07/27/06)
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