François-Marie Raoult

François-Marie Raoult (1830–1901) was a French chemist who formulated Raoult’s law, relating a solution’s composition to its vapor pressure.

Raoult’s law: A relation stating that each component’s partial vapor pressure in an ideal solution equals its pure-component vapor pressure times its mole fraction. This is the law that made Raoult’s name central to solution chemistry.
Dalton’s law of partial pressures: A gas mixture’s total pressure equals the sum of the partial pressures of its components. Raoult’s law gives component vapor pressures that combine according to Dalton’s law.
Physical chemistry: The branch of chemistry that uses physical principles to explain chemical systems and transformations. Raoult’s quantitative study of solutions helped shape this field.
Thermodynamics of solutions: The study of energy, equilibrium, and phase behavior in mixtures. Raoult’s quantitative relation became a central model for describing mixture equilibrium.
Vapor pressure: The pressure exerted by a vapor in equilibrium with its condensed phase at a given temperature. Raoult investigated how dissolved substances change the pressure above a liquid.
Chemical potential: A thermodynamic quantity measuring how a system’s energy changes when the amount of a component changes. Chemical-potential equality at phase equilibrium underlies the thermodynamic form of Raoult’s law.
École Normale Supérieure: A French institution of higher education and research founded in Paris in 1794. Raoult studied at this institution before beginning his scientific career.
Distillation: A separation process that uses differences in volatility to vaporize and condense mixture components. Vapor-pressure relations help predict how liquid composition affects distillation.
Mole fraction: The amount of one component in a mixture divided by the total amount of all components. It expresses the solution composition used in Raoult’s law.
Activity coefficient: A factor that measures how a component’s effective concentration departs from ideal-solution behavior. Activity coefficients quantify deviations from the proportionality Raoult described for ideal mixtures.

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