Jacques Charles

Charles flew the first hydrogen balloon and did an experiment filling 5 different balloons with the same volume of 5 different gases and heating them each uniformly. He noted the balloons each grew uniformly. This observation wasn't published until 1802, by Gay-Lussac, but the law was named for the original observer, Charles.

A real life example of Charles' Law would be a football inflated inside and then taken outdoors on a winter day and it would slightly shrink.

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