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The French physicist and chemist Joseph Louis Gay-Lussac (1778-1850) defined the Gay-Lussac law, which was named after him, for the uniform thermal expansion of gases. Thus, at constant pressure, all gases expand by 1/273 of their volume when heated by one degree Celsius. He also developed a system that the alcohol content in degrees (°). The amount is pure alcohol each given in 100 liters of wine, measured at 15 ° C. This system is used in the Anglo-American region, some of which is still mostly in the abbreviation GL today. The value in degrees corresponds to the number volume,

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