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Henry's Constant β
Henry's Constant
The value of the Henry constant for the substance (unit: atm*m3/mol) (from Henry's Law) is presented.
Henry's law is a chemical law, named after the English scientist William Henry (1775-1836), that applies to the equilibrium situation of a solvent in contact with a gas. If there is contact between a gas and a liquid solvent, gas molecules will dissolve in the solvent. If this continues long enough, an equilibrium will be reached, with the same number of particles going in or out of the solution. The concentration of the solute in such an equilibrium is directly proportional to the concentration of the gas. This is called Henry's law. In symbols, the law can look like this:
C = H * pg
In this formula, C is the concentration of the gas molecules in the liquid, H is the so-called Henry constant and pg is the partial pressure of the gas. The Henry constant thus gives the ratio between the concentration in the solution and the partial pressure of the gas. The unit of the Henry constant may differ depending on the unit used for C. In DOHSBase Compare, the Henry constant is shown in the unit "atm*m3/mol" and at 25οΏ½C.