Chapter04b - Atmospheric Moisture Relative Humidity and Dew...

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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. AbsoluteHumidity : themass of water vapor in a fixed volumeof air, i.e. the water vapor density. Specific Humidity : themass 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 pressureexerted by thewater vapor molecules alone. Dalton’s law. Saturation vapor pressure : thepressure that thewater vapor molecules would exert if the air weresaturated, i.e. themaximal vapor pressureat a given temperatureT.
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Humidity Humidity : the amount of water in theair. Absolute humidity : the mass of water vapor in a unit volumeof air. Specific humidity : themass of thewater vapor compared to the total mass of theair parcel. Water (mass) mixing ratio : Themass of water vapor compared to themass of the rest of theair 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?
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