EES 108 Class 10

# EES 108 Class 10 - Relative Humidity (3 equivalent...

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Relative Humidity (3 equivalent definitions) humidity   Saturation humidity   Absolute ratio   mixing   Saturation vapor water    of   ratio   Mixing pressure vapor    Saturation vapor water    of   pressure   Partial

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Relative Humidity Relative humidity: 100% RH:  Saturation RH < 100% If there is water, net evaporation RH > 100% Net condensation, precipitation humidity   saturation humidity   absolute
Relative humidity What is the relative humidity if the mixing ratio of  water vapor is 5 g/kg and the temperature is 25° C? Saturation mixing ratio = 20 g/kg, so RH = 5/20 = 25%

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Hot desert air with low relative humidity will actually have a higher water vapor-content than frigid air with high relative humidity
Dew point Definition Temperature that would produce  100% relative humidity  at current absolute humidity   When  T < dew point Condensation When  T > dew point Evaporation Frost point: Equilibrium for Sublimation/Deposition Frost point = temp for deposition. Frost point is always < 0º C (32º F)

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Saturation and dewpoint For some temperature,  T: Saturation mixing ratio  =  How much water vapor  at equilibrium? For some mixing ratio  M : Dewpoint  =  For what temperature would M be  saturated?
What is dewpoint for a mixing ratio of  30 g/kg? Around 32°C

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## This note was uploaded on 04/09/2008 for the course HIST 101 taught by Professor Guliver during the Spring '08 term at Vanderbilt.

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EES 108 Class 10 - Relative Humidity (3 equivalent...

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