Henry's Law Calculator

About this calculator

Henry's law states that the amount of a gas dissolved in a liquid is directly proportional to its partial pressure above the liquid: C = kH × P. The Henry's law constant kH is specific to each gas-solvent pair and drops as temperature rises, which is why a warm soda goes flat faster than a cold one and why dissolved oxygen in a lake falls as the water warms.

Environmental engineers use it to model how oxygen enters rivers and how volatile pollutants escape from groundwater into air, chemical engineers size gas absorption and stripping columns with it, and it explains decompression sickness in scuba diving, where nitrogen dissolved under pressure comes out of solution too fast on ascent. Beverage and aquarium CO₂ dosing also follow the same relationship.