# Raoult's Law

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Raoult's law is the vapor pressure of a solution is changed by the addition of a solute.

## formula

$$p_s = x_s p°_s$$

Where:

$$p_s$$ = vapor pressure of the solution

$$x_s$$ = mole fraction of the solvent in the solution

$$p°_s$$ = vapor pressure of the pure solvent at standard conditions