#latent_heat__heat_of_transformation  heat absorbed or radiated during a change of phase at a constant temperature and pressure
  supertype:  heat_energy__heat  a form of energy that is transferred by a difference in temperature
  subtype:  heat_of_condensation  heat liberated by a unit mass of gas at its boiling point as it condenses into a liquid; "the heat of condensation is equal to the heat of vaporization"
  subtype:  heat_of_fusion  heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature; "the heat of fusion is equal to the heat of solidification"
  subtype:  heat_of_solidification  heat liberated by a unit mass of liquid at its freezing point when it solidifies
  subtype:  heat_of_sublimation  heat absorbed by a unit mass of material when it changes from a solid to a gaseous state
  subtype:  heat_of_vaporization__heat_of_vaporisation  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

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