Gay-Lussac's law can refer to several discoveries made by French chemist Joseph Louis Gay-Lussac (1778–1850) and other scientists in the late 18th and early 19th centuries pertaining to thermal expansion of gasses and the relationship between temperature, volume, and pressure.
He is most often recognized for the Pressure Law which established that the pressure of an enclosed gas is directly proportional to its temperature and which he was the first to formulate (c. 1808). He is also sometimes credited, rightfully according to many modern scholars, with being the first to publish convincing evidence that, in Gay-Lussac’s shows the relationship between the pressure and temperature of a fixed mass of gas kept at a constant volume.
These laws are also known variously as the Pressure Law or Amontons's law and Dalton's law respectively. Wikipedia, Gay-Lussac Law
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