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*, specific gas constant for water vapor, 461.495J/(kg·K)
*, molar mass of dry air, 0.0289652kg/mol
*, molar mass of water vapor, 0.018016kg/mol
*, universal gas constant, 8.31446J/(K·mol)

The vapor pressure of water may be calculated from the saturation vapor pressure and relative humidity. It is found by:

where:
*, vapor pressure of water
*, relative humidity (0.0-1.0)

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