Abstract
Abstract Henry's law provides a basis to determine the solubility of gases in liquids. Henry found that at a constant temperature, the concentration of a soluble or semi‐soluble gas in a liquid was proportional to the partial pressure of the gas that is in equilibrium with the liquid. The proportionality constant is known as the Henry's law constant (HLC). Henry's law is applicable when there is chemical equilibrium between the gas and liquid phases, temperature is constant, and the solution is dilute (<1% solute concentration). Data for HLCs are available for a wide range of inorganic as well as organic elements and compounds. To meet the needs of readers who work in many different fields of water science, comprehensive references to HLCs are provided. While HLC data are abundant, the application of this information is complicated by a general lack of uniformity in the way the constants are defined. Consequently, it is critical for those seeking to apply HLC data to fully understand the assumptions used to develop those data. Likewise, consideration must be given to the units in which HLC data are reported.
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