i) The temperature at which a solid melt is known as .

ii) The temperature at which its vapour pressure is equal to the pressure of the gas above it is known as .

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Detailed Solution

Concept: A solid melts at its melting point and when the vapoour pressure and the pressure of gas becomes equal, that means it has reached its boiling point. Phase transitions are discussed in the terms that follow. Phase transition is the process by which a substance transforms from one state, such as solid, liquid, or gas, to another. When external factors like pressure, temperature, etc. change, a phase transition happens.
Melting point: The change of physical state from solid to liquid at normal atmospheric pressure is termed a melting point.
Boiling point: The point at which the vapour pressure of the liquid becomes equal to the pressure surrounding the liquid and vice versa is termed boiling point.
Hence, the answers are melting point and boiling point respectively.

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