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- Avogadro_constant abstract "In chemistry and physics, the Avogadro constant (symbols: L, NA) is the number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole. Thus it is the proportionality factor that relates the molar mass of a material to its mass. Avogadro's constant has the value 7023602214085700001♠6.022140857(74)×1023 mol−1 in the International System of Units (SI).Previous definitions of chemical quantity involved Avogadro's number, a historical term closely related to the Avogadro constant but defined differently: Avogadro's number was initially defined by Jean Baptiste Perrin as the number of atoms in one gram-molecule of atomic hydrogen, meaning (in modern terminology) one gram of (atomic) hydrogen. It was later redefined as the number of atoms in 12 grams of the isotope carbon-12 (12C) and still later generalized to relate amounts of a substance to their molecular weight. For instance, to a first approximation, 1 gram of hydrogen element (H), which has a mass number of 1 (atomic number 1), has 7023602200000000001♠6.022×1023 hydrogen atoms. Similarly, 12 grams of 12C, with the mass number of 12 (atomic number 6), has the same number of carbon atoms, 7023602200000000001♠6.022×1023. Avogadro's number is a dimensionless quantity and has the numerical value of the Avogadro constant given in base units.The Avogadro constant is fundamental to understanding both the makeup of molecules and their interactions and combinations. For instance, since one atom of oxygen will combine with two atoms of hydrogen to create one molecule of water (H2O), one can similarly see that one mole of oxygen (7023602200000000001♠6.022×1023 of O atoms) will combine with two moles of hydrogen (2 × 7023602200000000001♠6.022×1023 of H atoms) to make one mole of H2O.Mole and moles are frequently abbreviated as mol in chemical and mathematic notation.Revisions in the base set of SI units necessitated redefinitions of the concepts of chemical quantity and so Avogadro's number, and its definition, was deprecated in favor of the Avogadro constant and its definition. Changes in the SI units are proposed that will precisely fix the value of the constant to exactly 6.02214X×1023 when it is expressed in the unit mol−1 (see New SI definitions, in which an "X" at the end of a number means one or more final digits yet to be agreed upon).".
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- Avogadro_constant wikiPageExternalLink abstract;jsessionid=2BF5A65667EEDDCD40A985289CFDDC0B.f01t01?deniedAccessCustomisedMessage=&userIsAuthenticated=false.
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- Avogadro_constant wikiPageExternalLink www.acpo.csiro.au.
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- Avogadro_constant wikiPageWikiLink Absolute_temperature.
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- Avogadro_constant wikiPageWikiLink Anode.
- Avogadro_constant wikiPageWikiLink Atom.
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- Avogadro_constant wikiPageWikiLink Avogadro_project.
- Avogadro_constant wikiPageWikiLink Boltzmann_constant.
- Avogadro_constant wikiPageWikiLink Brady_Haran.
- Avogadro_constant wikiPageWikiLink CODATA.
- Avogadro_constant wikiPageWikiLink Carbon-12.
- Avogadro_constant wikiPageWikiLink Category:Amount_of_substance.
- Avogadro_constant wikiPageWikiLink Category:Dimensionless_numbers_of_chemistry.
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- Avogadro_constant wikiPageWikiLink Chemistry.
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- Avogadro_constant wikiPageWikiLink Faraday_constant.
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- Avogadro_constant wikiPageWikiLink Molar_volume.
- Avogadro_constant wikiPageWikiLink Mole_(unit).
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- Avogadro_constant wikiPageWikiLink Oxygen.
- Avogadro_constant wikiPageWikiLink Particle_number.
- Avogadro_constant wikiPageWikiLink Physical_constant.
- Avogadro_constant wikiPageWikiLink Physics.
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- Avogadro_constant wikiPageWikiLink Pound_mole.
- Avogadro_constant wikiPageWikiLink Pressure.
- Avogadro_constant wikiPageWikiLink Proposed_redefinition_of_SI_base_units.
- Avogadro_constant wikiPageWikiLink Relative_atomic_mass.
- Avogadro_constant wikiPageWikiLink Robert_Andrews_Millikan.
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- Avogadro_constant wikiPageWikiLink Rydberg_constant.
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- Avogadro_constant wikiPageWikiLink Silicon.
- Avogadro_constant wikiPageWikiLink Silver.
- Avogadro_constant wikiPageWikiLink Speed_of_light.
- Avogadro_constant wikiPageWikiLink Thermodynamic_temperature.
- Avogadro_constant wikiPageWikiLink Unified_atomic_mass_unit.