Gas Solubility and Release

According to Henry's law, gas solubility in water is directly proportional to partial gas pressure and inversely proportional to water temperature. Table 7.18.1 lists the solubility of air, nitrogen, and oxygen in water and their respective densities with respect to temperature.

The following equation determines the quantity of gas that can be dissolved in water at an elevated pressure:

where:

S = soluble gas concentration at an elevated pressure, mg/l

Sg = soluble gas concentration at one atmosphere, mg/l P = elevated system pressure, mm Hg Pg = atmospheric pressure, 760 mm Hg

The amount of gas that can be released from solution when the system is reduced to atmospheric pressure is calculated as follows:

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