Note:  Do not rely on this information. It is very old.

Henrys Law

Henry's Law, relating to the solution of gases in liquids, was enunciated in 1803, and states that "under equal circumstances of temperature water takes up in all cases the same volume of condensed gas as of gas under ordinary pressure." Hence, owing to the relation between the volume and pressure of gases [Boyle's Law], it follows that the quantity of gas absorbed by water varies directly as the pressure of the gas. The law was extended by Dalton, who showed that in the case of a mixture of gases, the quantity of each gas absorbed depends only on the pressure exerted by that gas, and not on the total pressure due to the mixture.