AN607 datasheet(32/41 Pages) SILABS

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AN607

Rev. 1.7

Table 5. Humidity Terms and Definitions

Term

Definition

Units

Pure water vapor pressure (no air or other gas)

N/m2 or Pa

p’

Actual vapor pressure (water vapor in air)

N/m2 or Pa

Pure water saturated vapor pressure (no air or other gas)

N/m2 or Pa

ps’

Actual saturated vapor pressure (water vapor in air)

N/m2 or Pa

Total atmospheric pressure

N/m2 or Pa

Water vapor enhancement factor

dimensionless

Volumetric humidity mass of water vapor/volume of humid gas

kg/m3

Molal mass (molecular weight) of dry gas (air)

kg/mol

Molal mass (molecular weight) of water vapor

kg/mol

mmass

Amount of substance in moles

mol

Universal gas constant in joules per mole of air per K

J/(mol)(K)

R’

Universal gas constant in joules per kilogram of air per K

J/(kg)(K)

Percent of saturation



% Relative humidity (%RH or %rh)

Mixing ratio kg vapor/kg dry gas

kg/kg

Specific humidity kg vapor/kg humid gas

kg/kg

h

Enthalpy change between phases

hig

Ice

gas

hif

Ice

liquid

hfg

Liquid

gas

s

Entropy change between phases

tdp

Dewpoint temperature

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