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latent heat
The quantity of heat required to bring about a change of state of a unit mass of a substance from solid to liquid (latent heat of fusion) or from liquid to gas (latent heat of vaporization) without change of temperature. At the freezing and boiling points of a substance, adding heat produces no rise in temperature until the change of state is complete. Energy required to effect the change of state is absorbed in the form of latent heat, and an equal amount of heat is liberated in the reverse process.
Related category
• HEAT AND THERMODYNAMICS
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