Henry was the first to give a
quantitative relation between
pressure and solubility of a gas in
a solvent which is known as
Henry’s law The law states that
at a constant temperature, the
solubility of a gas in a liquid is
directly proportional to the
partial pressure of the gas
present above the surface of
liquid or solution Dalton, a
contemporary of Henry, also
concluded independently that the
solubility of a gas in a liquid
solution is a function of partial
pressure of the gas If we use the mole fraction of a gas in
the solution as a measure of its solubility, then it can be
said that the mole fraction of gas in the solution is
proportional to the partial pressure of the gas over
the solution