Avogadro's law

Avogadro's law
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.
[1870-75; named after A. AVOGADRO]

* * *

Statement that, under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules (see Avogadro's number).

First proposed by the Italian scientist Amedeo Avogadro (1776–1856) in 1811, it became accepted с 1860. From the law, it follows that the volume occupied by one mole of gas (at standard conditions of 32 °F [0 °C] and 1 atmosphere of pressure) is the same for all gases (0.791 cubic feet [22.4 litres]).

* * *

      a statement that under the same conditions of temperature and pressure, equal volumes of different gases (gas) contain an equal number of molecules (molecule). This empirical relation can be derived from the kinetic theory of gases under the assumption of a perfect (ideal) gas (perfect gas). The law is approximately valid for real gases at sufficiently low pressures and high temperatures.

      The specific number of molecules in one gram- mole of a substance, defined as the molecular weight in grams, is 6.02214179 × 1023, a quantity called Avogadro's number, or the Avogadro constant (Avogadro's number). For example, the molecular weight of oxygen is 32.00, so that one gram-mole of oxygen has a mass of 32.00 grams and contains 6.02214179 × 1023 molecules.

      The volume occupied by one gram-mole of gas is about 22.4 l (0.791 cubic feet) at standard temperature and pressure (0° C, 1 atmosphere) and is the same for all gases, according to Avogadro's law.

      The law was first proposed in 1811 by Amedeo Avogadro (Avogadro, Amedeo), a professor of higher physics at the University of Turin for many years, but it was not generally accepted until after 1858, when an Italian chemist, Stanislao Cannizzaro (Cannizzaro, Stanislao), constructed a logical system of chemistry based on it.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Avogadro's law — Law Law (l[add]), n. [OE. lawe, laghe, AS. lagu, from the root of E. lie: akin to OS. lag, Icel. l[ o]g, Sw. lag, Dan. lov; cf. L. lex, E. legal. A law is that which is laid, set, or fixed; like statute, fr. L. statuere to make to stand. See… …   The Collaborative International Dictionary of English

  • Avogadro’s law — Avogadro dėsnis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. Avogadro’s hypothesis; Avogadro’s law; Avogadro’s principle vok. Avogadrosche Regel, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Avogadro’s law — Avogadro dėsnis statusas T sritis fizika atitikmenys: angl. Avogadro’s hypothesis; Avogadro’s law vok. Avogadrosche Regel, f; Avogadrosches Gesetz, n; Satz des Avogadro, m rus. закон Авогадро, m pranc. hypothèse d’Avogadro, f; loi d’Avogadro, f …   Fizikos terminų žodynas

  • Avogadro’s law — Avogadro dėsnis statusas T sritis Energetika apibrėžtis Apibrėžtį žr. priede. priedas( ai) MS Word formatas atitikmenys: angl. Avogadro’s law vok. Avogadrosches Gesetz, n rus. закон Авогадро, m pranc. loi d’Avogadro, f …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • Avogadro's law — n. the principle, formulated by Avogadro, that equal volumes of all gases under identical conditions of temperature and pressure contain equal numbers of molecules …   English World dictionary

  • Avogadro's law — [ Amedeo Avogadro] Avogadro s law (Avogadro s Hypothesis, or Avogadro s Principle) is a gas law named after Amedeo Avogadro, who in 1811 hypothesized that:: Equal volumes of ideal or perfect gases, at the same temperature and pressure, contain… …   Wikipedia

  • Avogadro's law — Avo·ga·dro s law .av ə .gäd (.)rōz , .äv , .gad n a law in chemistry: equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules called also Avogadro s hypothesis Avo·ga·dro .av ə gäd (.)rō, .äv Count… …   Medical dictionary

  • Avogadro's law — (also Avogadro s hypothesis) noun Chemistry a law stating that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules …   English new terms dictionary

  • Avogadro's law — A′voga′dro s law′ n. chem. the principle that equal volumes of all gases at the same temperature and pressure contain the same number of molecules • Etymology: 1870–75; after A. Avogadro …   From formal English to slang

  • Avogadro's law — n. Physics the law that equal volumes of all gases at the same temperature and pressure contain the same number of molecules …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”