Question

what is the latent heat of fussion

Answer 1

the amount of heat energy required to change 1kg of solid into liquid at it's melting point

Answer 2

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpyresulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure.