Question

Give geographical reasons - Air becomes saturated.

Answer 1

1) air can hold moisture in the specific quantity
at specific temperature
2) when the air holds the moisture to the hundred % capacity then the air becomes actuated

Answer 2

ANSWER:

Air becomes saturated when the "rate of evaporation becomes equal to the rate of condensation".

EXPLANATION:  

We know that when water becomes heated it changes into water vapour and these vapours becomes light and moves up, this process is called as evaporation. And when these water vapour starts cooling they form clouds and these process is called as condensation.

But there comes a point when rate of evaporation is equal to rate to condensation, at this point the air becomes saturated. It means that now the air present can not hold any more water vapour. It can also takes place when the air in the upper atmosphere becomes very cold so that the rising water vapour cannot be accumulated in that already condensed air, at this point, "air is said to be saturated".