A law stating that the volumes of gases undergoing a reaction at constant pressure and temperature are in a simple ratio to each other and to that of the product.
- Charles' law also is known as Gay-Lussac's law and the constant pressure law.
- This important elaboration came to be known as Gay-Lussac's law of combining volumes.
- This law provides an explanation for why Gay-Lussac's law of combining volumes works.
Early 19th century: named after Joseph L. Gay-Lussac (1778–1850), French chemist and physicist.
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