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Henry's law coefficients can be expressed in at least four sets of units. Two of these are nominally dimensionless, but because they represent either ratios of concentrations or ratios of mass fractions their values differ greatly.

Henry's Law Conversions

Units for Henry's Law Constant Conversions

Hcc = Concentration/Concentration          (dimensionless)
Hyx = Mole Fraction Y / Mole Fraction X     (dimensionless)
Hpx = Partial Pressure / Mole Fraction X   (atmospheres)
Hpc = Parial Pressure / Concentration      (atm m3/mol)

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Page author: Jim Weaver/Clay Owensby, of U.S. EPA, Office of Research and Development, Athens Georgia who last modified this content on: January 13, 2003

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