The ratio of the mass of water vapor to the mass of dry air is known as

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The ratio of the mass of water vapor to the mass of dry air is known as absolute humidity. Dew point is the temperature at which air becomes saturated with water vapor and dew or frost begins to form. Relative humidity is the amount of water vapor in the air compared to how much it could hold at a specific temperature, given as a percentage. None of these definitions match the ratio between the mass of water vapor and dry air, which is absolute humidity.

The Ratio of the Mass of Water Vapor to the Mass