#heat_energy__heat  a form of energy that is transferred by a difference in temperature
  supertype:  #energy  (physics) the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
  subtype:  #heat_of_dissociation  the heat required for a fluid substance to break up into simpler constituents
  subtype:  #heat_of_formation  the heat evolved or absorbed during the formation of one mole of a substance from its component elements
  subtype:  #heat_of_solution  the heat evolved or absorbed when one mole of a substance is dissolved in a large volume of a solvent
  subtype:  #latent_heat__heat_of_transformation  heat absorbed or radiated during a change of phase at a constant temperature and pressure
     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
  subtype:  #specific_heat  the heat required to raise the temperature of one gram of a substance one degree centigrade

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