Joseph Louis Gay-Lussac

French chemist and physicist (1778-1850)
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Joseph Louis Gay-Lussac (6 December 1778 – 9 May 1850) was a French chemist and physicist. He is mostly known because he discovered that water is made up of two atoms of hydrogen and one atom oxygen with Alexander von Humboldt. He is also known for two laws related to gases and for his work on alcohol and water mixtures.