The Beckmann differential
The Beckmann differential thermometer is based on this principle, whose namesake was memorialized in a speech by van't Hoff in 1902. A mixture of ethanol and water will positively deviate from it, while a mixture of trichloromethane and ethoxyethane will result in a negative deviation. It serves as one of the theoretical bases for fractional distillation, and solutions that obey it are said to be ideal. FTP, name this law which can be stated as P equals X times P-sub-zero, indicating that the vapor pressure of a solution is lowered by the addition of solutes to a solvent.
The Beckmann differential thermometer is based on this principle, whose namesake was memorialized in a speech by van't Hoff in 1902.
Raoult's Law