Where does water vapor come from in the air?

Water evaporates under the influence of temperature. The higher the temperature, the larger the surface and the rate of evaporation of water. About 71% of the Earth’s surface is oceans and seas. Steam comes from their surface, which is concentrated in the clouds. There is always a minimum amount of water vapor in the air at any temperature, but only the amount of steam can differ, which is not constant and changes.