Specific Latent Heat
While change the states every substance takes heat in or liberated out. But during the course of changes, the temperature remains constant, although the heat energy is absorbed or liberated by the substance till the conversion is completed.
So the specific latent heat of a substance is defined as “The amount of heat supplied to or withdrawn from unit mass of the substance at a certain temperature (known as melting point or boiling point) is called the specific latent heat or latent heat of the substance.”
It is dependent on pressure and is different for different substance.