Avogadro's number


Avogadro's number
   , Avogadro constant (NA)
   a unit of relative quantity equal to the number of atoms or molecules per mole of a substance. The currently accepted value is 6.022 141 79 x 1023 per mole with an uncertainty of 0.000 000 47 x 1023 per mole (about 80 parts per billion). The atomic mass unit (see above), in grams, is equal to one divided by this number. The unit is named for the Italian chemist and physicist Amedeo Avogadro (1776-1856). Avogadro was the first to conclude from Dalton's atomic theory that equal volumes of gases (at the same temperature and pressure) must contain equal number of molecules.

Dictionary of units of measurement. 2015.

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  • Avogadro's number — or Avogadro number .gäd (.)rō , .gad n the number 6.023 × 1023 indicating the number of atoms or molecules in a mole of any substance compare AVOGADRO S LAW * * * (N) (NA) the number of molecules in one mole of a substance: 6.023 Ч 1023 …   Medical dictionary

  • Avogadro’s number — Avogadro konstanta statusas T sritis fizika atitikmenys: angl. Avogadro’s constant; Avogadro’s number vok. Avogadro Konstante, f; Avogadrosche Konstante, f rus. постоянная Авогадро, f; число Авогадро, n pranc. constante d’Avogadro, f; nombre… …   Fizikos terminų žodynas

  • Avogadro's number — number indicating the quantity of atoms in a gram atom or molecules in a gram molecule (Chemistry) …   English contemporary dictionary

  • Avogadro's number — Chem. the constant, 6.02 × 1023, representing the number of atoms in a gram atom or the number of molecules in a gram molecule. Symbol: N Also called Avogadro constant. Cf. Loschmidt s number. [1925 30; see AVOGADRO S LAW] * * * Number of units… …   Universalium

  • Avogadro's number — noun Etymology: Count Amedeo Avogadro Date: 1924 the number 6.022 × 1023 indicating the number of atoms or molecules in a mole of any substance called also Avogadro number …   New Collegiate Dictionary

  • Avogadro's number — /ævəˌgædroʊz ˈnʌmbə / (say avuh.gadrohz numbuh) noun the number of atoms or molecules in a mole of substance; 6.02252 × 1023 per mole. Also, Avogadro s constant. {See Avogadro s hypothesis} …   Australian English dictionary

  • Avogadro's number — noun The number of atoms present in 0.012 kilograms of isotopically pure Carbon 12, being 6.0221415 x 10. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance. Syn: Avogadro constant …   Wiktionary

  • Avogadro's number — A′voga′dro s num′ber n. chem. the constant, 6.02 x 1023, representing the number of atoms in a gram atom or the number of molecules in a gram molecule Symbol: N II, 6) Also called A′voga′dro con stant. • Etymology: 1925–30; after A. Avogadro …   From formal English to slang

  • Avogadro's number — noun the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000) • Syn: ↑Avogadro number • Hypernyms: ↑constant …   Useful english dictionary

  • Avogadro constant — or Avogadro number n. the number of molecules contained in one mole (molecular weight in grams) of a substance, equal to 6.022137 × 1023: symbol, N, NA, or L: often Avogadro s number * * * …   Universalium

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