Water vapour pressure is the atmospheric pressure which is exerted by water vapour (water in its gaseous state). It is one way of measuring the humidity of the air.
AT = Ta + 0.348×e - 0.70×ws + 0.70×Q/(ws + 10) - 4.25where:Ta = Dry bulb temperature (°C)e = Water vapour pressure (hPa) [humidity]ws = Wind speed (m/s) at an elevation of 10 metersQ = Net radiation absorbed per unit area of body surface (w/m2) ...
Relative Humidity: The ratio of the actual water vapour content of a given mass of air to that it would hold at saturation, usually expressed as a percentage. Also, the ratio of the water vapour pressure to the its saturation vapour pressure.
 See also: Water, Ocean, Light, Evaporation, Earth
  
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