Moisture; dampness; a moderate degree of wetness, which is perceptible to the eye or touch; -- used especially of the atmosphere, or of anything which has absorbed moisture from the atmosphere, as clothing.
The content of water vapor in the air, expressed as a percent of the maximum amount of water vapor that the air can hold at the given temperature; also called relative humidity. The capacity of the air to hold moisture increases with temperature, so if the temperature changes without changing the absolute content of the atmospheric moisture, the relative humidity will also change.
A general term for the presence of water vapour in air. There is a known limit to the amount of water vapour that air can hold at any particular temperature. Absolute - The amount of moisture in air. It is usually expressed as the weight of water vapour in a unit weight of dry air Relative - At a given temperature, this is the amount of moisture in air as a percentage of the maximum moisture carrying capacity of the air.