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Why do liquids change to vapours on heating?

Updated: 8/17/2019
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14y ago

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When you increase the temperature of a liquid, its molecules move faster and faster, on average. Eventually, the molecules are moving so fast that the forces of attraction between the molecules are overcome and a vapour is formed. When the average temperature exceeds the boiling point, this vaporization can happen within the liquid, as well as at the surface. That is what boiling is.

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Q: Why do liquids change to vapours on heating?
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