Define latent heat of fusion and latent heat of vaporisation.

1.	Define latent heat of fusion and latent heat of vaporisation.
Answer» Solution :Change of state of a substance from solid to liquid is called melting or fusion. The quantity of heat REQUIRED to change a solid at its melting points to liquid at the same TEMPERATURE is called L.H. of fusion. The quantity of heat required to change a liquid at its boiling POINT to its vapour at the same temperature is called the latent heat of vaporisation. Melting point and boiling point DEPENDS on pressure S.L. UNIT of latent heat is J kg.

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