It varies. There is no single percentage value
Yes, in the atmosphere water vapour falls as rain.
it becomes water vapour in the atmosphere.
0.082
ionosphere
Humidity is the amount of water vapour in the atmosphere
transpiration
about 4 percent
The most variable abundance in the atmosphere is Water Vapour and Ozone
amount of water vapour in the atmosphere, or in a gas
The partial pressure of water (vapor) is included in the total pressure of the atmosphere (air) when boiling.
when the water turns into gas form as water vapour
plants release extra water in the form of water vapour from small holes of their leaves known as stomata ,that water vapour rises in the atmosphere in the form of clouds and that water vapour returns to earth in form of rain .