Define melting point.

Define the latent heat of fusion of ice. Give its value.

The quantity of heat required to change $1 \mathrm{kg}$ of a solid into liquid at atmospheric pressure at its melting point is called

The SI unit of latent heat of fusion is _____.

$\mathrm{A}: \mathrm{J} {\mathrm{kg}}^{-1} \mathrm{B}: \mathrm{J} {\mathrm{g}}^{-1}$ (Enter your correct answer as $\mathrm{A}$ or $\mathrm{B}$) 

The latent heat of vaporisation of water is _____.

Why is steam at $100°\mathrm{C}$ a more effective heating agent than water at $100°\mathrm{C}$?

Why does the temperature remain constant during the change of state?

Define the following with examples:

a. Sublimation.

b. Evaporation.