Question

why is water vapour more during day time Give the reason

Answer 1

Relative humidity is the ratio, expressed as a percentage, of the water vapor present in the atmosphere to the maximum possible amount. When the air temperature equals the dew point, the relative humidity is 100 percent. The warmer the air, the greater its capacity for water vapor. Thus, the relative humidity increases as the temperature falls toward the dew point and decreases as it rises. The relative humidity is usually highest around sunrise when the overnight low temperature is frequently close to the dew point. The humidity drops during the day as the temperature rises and usually reaches its lowest value in the middle or late afternoon when the day's maximum temperature is recorded.

Answer 2

Water vapour rise more during the day time bcz during the day time, temperature is more. And more is the temperature, more is the evaporation.

And thus water vapour rises.