heat-vaporization

heat of vaporization

noun Physics.
the heat absorbed per unit mass of a given material at its boiling point that completely converts the material to a gas at the same temperature: equal to the heat of condensation.
Compare latent heat.
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American Heritage
Science Dictionary
heat of vaporization  
The amount of heat required to convert a liquid into a gas at constant temperature and pressure. A gas releases the same amount of heat when it becomes liquid. Compare heat of fusion.
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