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Noun: heat of vaporization
  1. Heat absorbed by a unit mass of a material at its boiling point in order to convert the material into a gas at the same temperature
    "The high heat of vaporization of water contributes to its effectiveness as a cooling agent";
    - heat of vaporisation [Brit]

Derived forms: heats of vaporization

Type of: heat of transformation, latent heat

Encyclopedia: Heat of vaporization