Humidity is the amount of water vapor in the air. In general, there are three types of humidity. Absolute humidity is the density of water vapor in the air, which is typically expressed as grams of water per cubic meter of air. Specific humidity is the ratio of the mass of water vapor to a volume of air; specific humidity is a measure that does not change with atmospheric pressure and temperature. Relative humidity is the ratio of the actual amount of water in a volume of air at a given temperature and pressure to the maximum amount of water vapor that volume of air can hold at that temperature and pressure.
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