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Henry's Law states that at constant temperature, the concentration of a dissolved gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. C = P / kH.

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1. 1C = P / kH (where kH is Henry's law constant, units L·atm/mol)
2. 2Or: P = kH × C
3. 3Temperature-dependent: gases become less soluble at higher temperatures
4. 4kH for O₂ ≈ 769 L·atm/mol · kH for CO₂ ≈ 29.4 L·atm/mol

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