Question

Why is least heat supplied during melting called latent heat of fusion?

Answer 1

1. The amount of heat required to change the state of unit mass m of the substance at constant temperature is called the latent heat of a substance.
2. The amount of heat required to change a unit mass of solid into liquid is called the specific latent heat of fusion.
3. $Q=mL,Q=heatenergy,m=mass,L=latentheat$
4. As during this process there is a phase change from solid to liquid also the temperature remains constant hence it is known as latent heat of fusion.