Henry's constant \( H \) varies with temperature, as given by:

\[ H = \frac{1}{\exp\left(A + \frac{B}{T} + C\ln T + DT\right)} \]

where \( H \) is in bar; \( A, B, C \) and \( D \) are constants specific to each species; and \( T \) is temperature (K).

Henry's law is used to calculate the mole fraction \( x \) of a species dissolved in water:

\[ xH = P, \]

where \( P \) is the partial pressure (bar).

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