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Definition: A relation stating that the relative volumes of gases in a chemical reaction are present in the ratio of small integers (assuming all gases are at the same temperature and pressure).
Also Known As: Gay-Lussac's Law
Examples: In the reaction
2 H2(g) + O2(g) → 2 H2O(g)
2 volumes of H2 react with 1 volume of O2 to produce 2 volumes of H2O.
