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Enthalpy change
The heat energy measured at a constant pressure
Changing state
As the substance is changing stage, temperature remains constant because the heat energy is used to break the forces or bonds, rather than kinetic energy for movement
Enthalpy change of melting (Fusion)
Energy required to turn solid into a liquid
Enthalpy change of vaporisation (Boiling)
Energy required to turn a liquid into gas
Gas to solid
Deposition
Solid to gas
Sublimation