Raoult's law

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Ra·oult's law

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.
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References in periodicals archive ?
When an element becomes solute in another element, the vapor pressure of each element will function according to Raoult's law (the vapor pressure of either element is proportional to its mole fraction in the solution multiplied by its normal vapor pressure at the temperature in question).