What is the ratio of actual water vapor the air to the amount of water vapor needed to reach saturation content?
Saturation describes an equilibrium condition.........and is a function of temperature
And we can represent this is as...........
This always occurs, and must be accounted for when we collect a gas by bubbling the gas into an inverted container filled with water, which the gas displaces. When the level of water in the container is equilibrated with that of the OUTSIDE container: