raoult's law

noun Physical Chemistry.

1. the principle that the fraction by which the vapor pressure of a solvent is lowered by the addition of a nonvolatile, nonelectrolytic solute is equal to the mole fraction of the solute in the solution.

n.

1. The principle that the vapor pressure of a solution is equal to the vapor pressure of the pure solvent multiplied by the mole fraction of the solvent in the solution.