Raoult's law for a solution containing volatile components states that the partial pressure of a volatile component present in a solution is directly proportional to the mole fraction of that component at a given temperature. $P_A \alpha \chi_A \;\text{ or }\; P_A=K\chi_A$ Raoult's law and Henry's law are similar as both gives equation to find partial pressure of gases. $P_A = K \chi_A \;\;\;\;\;\;\;\;\;\;\;\; P_A = K_H \chi_A$ $\text{ (Raoult's law) }\;\;\;\text{ (Henry's law) }\;$