Avogadro's law

American  

noun

Chemistry.

1. the principle that equal volumes of all gases at the same temperature and pressure contain the same number of molecules. Thus, the molar volume of all ideal gases at 0° C and a pressure of 1 atm. is 22.4 liters.

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Avogadro's law British  

noun

1. the principle that equal volumes of all gases contain the same number of molecules at the same temperature and pressure

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Avogadro's law Scientific  

/ ä′və-gä′drōz /

1. The principle that equal volumes of all gases under identical conditions of pressure and temperature contain the same number of molecules. Avogadro's law is true only for ideal gases (gases in which there is no interaction between the individual molecules).

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Etymology

Origin of Avogadro's law

First recorded in 1870–75; named after A. Avogadro

Example Sentences

Using Avogadro’s law as a starting point, explain why.

From Textbooks • Feb. 14, 2019

Avogadro’s law may be used in stoichiometric computations for chemical reactions involving gaseous reactants or products.

From Textbooks • Feb. 14, 2019

According to Avogadro’s law, equal volumes of gaseous N2, H2, and NH3, at the same temperature and pressure, contain the same number of molecules.

From Textbooks • Feb. 14, 2019

It is to the molecule, considered as the unit of physical structure, that Avogadro's law applies.

From A History of Science — Volume 4 by Williams, Henry Smith

The great generalization, usually known as Avogadro's law, runs thus: "Equal volumes of gases measured at the same temperature and under the same pressure contain equal numbers of molecules."

From Heroes of Science Chemists by Muir, M. M. Pattison (Matthew Moncrieff Pattison)