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Relative humidity (Specific humidity) is the ratio of the amount of water vapor currently present in the air to the maximum amount of water vapor the air can hold at the same temperature. This ratio is typically expressed as a percentage (%). The capacity of air to hold water vapor is primarily a function of air temperature; warm air can contain or hold more moisture than cold air. When air reaches its maximum moisture capacity, it is said to be saturated, and at this point, relative humidity is