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

This deduction from Avogadro's law is now a part and parcel of our general chemical knowledge.

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

Avogadro, his elucidation of the atomic theory, 138, et seq.; introduces the idea of molecules, 140; law known as Avogadro's law, 143.

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