Henry's Law Calculator

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. The law is expressed as C = kH × P, where C is concentration, kH is Henry's law constant, and P is partial pressure.

To calculate partial pressure, rearrange Henry's Law equation: P = C / kH. You need to know the gas concentration in the liquid and the Henry's law constant for your specific gas-liquid system at the given temperature.

A high Henry's law constant indicates high gas solubility in the liquid. This means more gas molecules dissolve at a given partial pressure. Conversely, a low constant means the gas is less soluble and fewer molecules dissolve.

Use Henry's Law for calculating gas solubility in environmental studies, chemical engineering processes, beverage carbonation, blood gas analysis, and any situation involving gas-liquid equilibrium at constant temperature.

Temperature significantly affects Henry's law constant. For most gases, solubility decreases as temperature increases, meaning the Henry's constant changes with temperature. Always use constants appropriate for your specific temperature conditions.

To find gas concentration, use the direct Henry's Law equation: C = kH × P. Multiply the Henry's law constant by the partial pressure of the gas above the liquid to get the equilibrium concentration of dissolved gas.

Common units include mol/(L·atm) for Henry's constant, mol/L for concentration, and atm for partial pressure. Other unit systems like Pa for pressure or mg/L for concentration are also used depending on the application.

Henry's Law applies best to dilute solutions and gases that don't chemically react with the solvent. It's most accurate for ideal solutions at moderate pressures and temperatures where gas-liquid interactions are primarily physical.