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Question

When 1 kg of a substance changes from solid to liquid at its melting point, it must absorb an amount of heat equal to which of the following?
A. Latent heat of vaporization

B. Specific heat of phase changes

C. Latent heat of fusion

D. Specific heat capacity

Answer 1

It's the Latent heat of fusion.

 

Heat of fusion is a quantity of a given substance that equals to the amount of energy required to melt the solid form of the substance per unit mass melted. It is also the amount of energy required to freeze the liquid form of the substance per unit mass frozen.

 

Note that this value is not quite constant, as even for a given substance, it varies slightly when you change the pressure.