Avogadro's law

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.

Avogadro's law

noun

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

Avogadro's law

/ 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).

Word History and Origins

Origin of Avogadro's law¹

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

Example Sentences

Avogadro’s Law says the other molecules in the air, such as oxygen and nitrogen, must leave that space.

From Washington Post

Amedeo Avogadro discovered this phenomenon in the early 19th century, and since then, it’s been known as Avogadro’s Law.

From Washington Post

There is a chapter also on Avogadro's law and the Kinetic theory, which chemical as well as physical students will read with interest.

From Project Gutenberg

Of late years the great naturalists, Clausius, Helmholtz, Joule, Rankine, Clerk Maxwell and Thomson have developed the physical theory of molecules, and have shown that Avogadro's law may be deduced as a necessary consequence from a few simple physical assumptions.

From Project Gutenberg

Assume any number of molecules we please in the one volume of hydrogen—say ten—there must be, by Avogadro's law, also ten molecules in the one volume of chlorine; but inasmuch as the volume of hydrochloric acid produced is double that of either the hydrogen or the chlorine which combined to form it, it follows, by the same law, that twenty molecules of hydrochloric acid have been formed by the union of ten molecules of hydrogen with ten molecules of chlorine.

From Project Gutenberg