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Answered 2012-01-06 03:56:48

Generally, when substances are heated, their particles begin to move faster. In solids, molecules vibrate together; heat makes them vibrate harder, and when the particles get hot enough, they vibrate together hard enough to break away from the molecule structure -- this is called melting, like when ice melts into water.

In liquids, molecules tend to slide around each other; when they are heated, they start to bounce off of each other, and the liquid mass expands. If they bump off of each other hard enough, they too can break away from their molecule structure, and float about independently as a gas molecule -- that's called evaporation, like when you heat water and steam is produced.

Gas molecules tend to bounce off of each other; when they are heated, the gas mass expands because they bounce off of each other harder.

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