This statement is known as Avogadro's hypothesis (or Avogadro's Law). It was first proposed by Amedeo Avogadro in 1811. It directly relates the volume of a gas to the number of particles (molecules or atoms) it contains, under constant temperature and pressure conditions.
The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as
Asked in UPSC NDA 2 2017 · Topic: Physical and Chemical Changes, Solution (Definition and Characteristics of Chemical Changes (Chemical Reactions))
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Answer: A. Avogadro's hypothesis
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