I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid
III. Relative Humidity = $\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}$ x 100%

IV. The saturated vapour pressure of water increases with temperature

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