The proposition 'equal volumes of different gases contain equal number

The proposition ‘equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure’ is known as

Avogadro's hypothesis

Gay-Lussac's hypothesis

Planck's hypothesis

Kirchhoff's theory

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This question was previously asked in

UPSC NDA-2 – 2017

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The proposition that ‘equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure’ is a fundamental principle in chemistry and physics of gases.

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.

Gay-Lussac’s Law of Combining Volumes states that when gases react, the volumes of the reactants and products, measured at the same temperature and pressure, bear a simple whole-number ratio to one another. Planck’s hypothesis (specifically, Planck’s quantum hypothesis) states that energy can be emitted or absorbed only in discrete packets called quanta. Kirchhoff’s laws are important in electrical circuit analysis (Kirchhoff’s circuit laws) and thermal radiation (Kirchhoff’s law of thermal radiation).

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