Chapter04b - Atmospheric Moisture: Relative Humidity and...

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Atmospheric Moisture: Relative Humidity and Dew Point
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RECAP Hydrological cycle : transport of water and energy. Humidity : the water content in the air. Absolute Humidity : the mass of water vapor in a fixed volume of air, i.e. the water vapor density. Specific Humidity : the mass of water vapor in a fixed total mass of air. Water mixing ratio : the mass of water vapor in a fixed mass of the remaining dry air. Actual vapor pressure : the amount of water vapor in terms of the amount of pressure exerted by the water vapor molecules alone. Dalton’s law. Saturation vapor pressure : the pressure that the water vapor molecules would exert if the air were saturated, i.e. the maximal vapor pressure at a given temperature T.
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Humidity Humidity : the amount of water in the air. Absolute humidity : the mass of water vapor in a unit volume of air. Specific humidity : the mass of the water vapor compared to the total mass of the air parcel. Water (mass) mixing ratio : The mass of water vapor compared to the mass of the rest of the air parcel. air of volume vapor water of mass AH = air of mass total vapor water of mass SH = air dry of mass vapor water of mass MR =
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Saturation Vapor Pressure What is it? This is the partial pressure of H
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Chapter04b - Atmospheric Moisture: Relative Humidity and...

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