Absolute humidity is the actual amount of water vapor in a volume of air, usually expressed as grams of water vapor per cubic meter, and it does not depend on temperature. Relative humidity is a percentage that compares the water vapor present with the maximum amount the air can hold at its current temperature. Warm air can hold more moisture than cold air, so the same absolute humidity produces a higher relative humidity when the air is cooler and a lower relative humidity when it is warmer.
