Relative humidity is a ratio of the air's actual water vapor content compared with the amount of water vapor required for saturation at that temperature (and pressure).

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Relative humidity is expressed as a percentage and represents the amount of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature and pressure. It is a ratio of the actual water vapor content to the saturation point, which is determined by the temperature and pressure.

Relative Humidity Is a Ratio of the Air's Actual Water