Question

the amount of water vapour in the air decreases with increase in height​

Answer 1

Answer:

The amount of water vapor is the air tends to decrease with altitude. This is because temperatures decrease with height and the availability of a moisture source is farther away.

Explanation:

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Answer 2

Answer:

If the relative humidity is 50 %, the air contains half the water vapour required for it to be saturated. If the amount of water vapour in the air increases, the relative humidity increases, the vise versa. However, relative humidity depends on air temperature, too.