Humidity, relating to the quantity of moisture in atmospheric air, is accurately given by equations derived from the ideal-gas law and Raoult’s law for H2O.
(a) The absolute humidity h is defined as the mass of water vapor in a unit mass of dry air. Show that it is given by:
where
(b) The saturation humidity
where
(c) The percentage humidity is defined as the ratio of h to its saturation value.
expressed as a percentage. On the other hand, the relative humidity is defined as the ratio of the partial pressure of water vapor in air to its vapor pressure, expressed as a percentage. What is the relation between these two quantities?
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