A warm air mass may hold more moisture (water vapor)than a cold air mass of the same volume,and yet may have lesser relative humidity.

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Relative humidity is the ratio of the current amount of water vapor in the air to the maximum amount it can hold at that temperature. Warm air can hold more moisture, so even if it contains more water vapor than cold air, its relative humidity can be lower if it is not saturated.

A Warm Air Mass May Hold More Moisture (Water Vapor)than