Question

What is relative humidity? Why does it vary at coastal and desert areas?
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Answer 1

Answer:

The following can be the answer,hope it helps;

Explanation:

Relative humidity is the amount of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air than warm air. A related parameter is the dew point.

It varies from place to place because of different amounts of water present in the atmosphere. Since there is higher water content in coastal area, it is humid. whereas there is less water in the atmosphere in the desert have their is less humidity coastal areas.