Charles, Jacques-Alexandre-César


A French scientist and hot-air balloonist, born in Beaugency, France (1746 – 1823). Charles invented and flew in the first hydrogen-filled balloon; while working with hot-air balloons, he observed in 1787 that a gas’s temperature and volume were linearly correlated. This relationship between temperature and volume was later named Charles’s Law by the French scientist Joseph-Louis Gay-Lussac in 1801.

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