The heat of fusion, also known as the latent heat of fusion, is the amount of heat required to change a unit mass of a substance from solid to liquid state at its melting point. The formula to calculate the heat of fusion () is:
Where:
- is the heat of fusion (in joules, J),
- is the mass of the substance undergoing fusion (in kilograms, kg), and
- is the specific latent heat of fusion (in joules per kilogram, J/kg).
In SI units, the heat of fusion is typically measured in joules per kilogram (J/kg), and the mass is in kilograms (kg).