First slide

Change of state

Question

Select the correct statement

Easy

A

On heating continuously a substance changes from solid to gas via liquid phase only
B

Change of phase occurs at variable temperature
C

Water can exist in all 3 phases
D

Boiling point increases with increase in pressure

Solution

Water can exist in all 3 phases that are in thermal equilibrium with each other. It is referred to as the triple point of water. When a substance is heated it may change directly from solid to gas. This is called sublimation. Boiling point increases with decrease in pressure. Change of phase occurs at constant pressure.

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