Avogadro's number

The number of items in a mole, approximately 6.0221 × 10²³. Also called Avogadro constant.

[After Amedeo Avogadro.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

A′voga′dro's num′ber

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 Also called A′voga′dro con`stant.

[1925–30; after A. Avogadro]

Avogadro's number

The number of atoms or molecules in a mole of a substance, approximately 6.0225 × 10²³. See more at mole³.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

Avogadro's number - the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)

Avogadro number

constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"

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References in periodicals archive

where N0 is Avogadro's number, Mw is weight average molecular weight, which can be measured through a GPC, and [[eta]] is the intrinsic viscosity which can be calculated by measuring solution viscosity of a polymer at various concentration levels.

Cold flow index: An important processing parameter for polybutadiene rubbers

The Six.02 Bioservices name reflects Avogadro's number (6.023 x 1023), defined as the number of atoms or molecules per mole of any substance.

Kempbio Acquired by Six.02 Bioservices; Relaunches as Kemp Proteins

Vh is the hydrodynamic volume, Mw is the mol weight from LLS, [n] NA is the Avogadro's number. The Rh can be calculated from Vh and the ratio of the geometric-to-hydrodynamic radii n can be determined as follows:

SHORT COMMUNICATION - Characterization and Antioxidant Activity of an Exopolysaccharide Produced by Ginkgo polypores

here, x is the overall monomer conversion, t the time (min), [k.sub.p] is the propagation rate constant (L[mol.sup.-1] [s.sup.-1]), [M.sub.p] the monomer concentration inside the particles (mol [L.sup.-1]), n the average number of radicals per particle (-), [N.sub.p] is the total number of polymer particles ([L.sup.-1]), V the total reaction volume (L), [M.sub.T] is the total monomer to be fed (mol), and Nm is Avogadro's number ([mol.sup.-1]).

Understanding the Semicontinuous-Heterophase, Surfactant-Supported, Acrylamide Inverse Polymerization

Avogadro's number is the number of atoms or molecules in one mole of a substance.

A Naturopath's View of Homeopathy or Psychotherapy with Props

where C is the activity concentration in Bq/kg, [M.sub.w] is the molecular weight (g/mol), N is Avogadro's number, and [t.sub.1/2] is the half-life in seconds.

The Activity Concentrations and Radium Equivalent Activity in Soil Samples Collected from the Eastern Part of Basrah Governorate in Southern Iraq

where M = [[SIGMA].sub.i][A.sub.i][n.sub.i] is the molecular weight of the sample, Ai is the atomic weight of the ith element, [n.sub.i] is the number of the formula units of a molecule, and [N.sub.A] is the Avogadro's number. Effective atomic cross section, [[sigma].sub.a], has been calculated using the following equation:

A Comprehensive Study on Gamma Rays and Fast Neutron Sensing Properties of GAGOC and CMO Scintillators for Shielding Radiation Applications

For constant pressure and almost constant temperature, T, the above expression means that volume, V, is directly proportional to the number of moles liberated, n, but note that n = N/N[alpha], where N is the number of molecules and [N.sub.[alpha]] is Avogadro's number. Both N and n are proportional to the number of bonds broken during electrolysis.

Model for the electrolysis of water and its use for optimization

On the East Coast, students at Charlottetown's University of Prince Edward Island celebrated Mole Day--the unofficial holiday commemorating Avogadro's number (6.022 x [10.sup.23])--with a 6:02 am breakfast and a celebratory ice cream cake.

Chemists captivate Canadian kids with nifty experiments

This number allows scientists to calculate a different fundamental value, the Avogadro constant (or Avogadro's number).

Revamping the measure of mass: new efforts bring scientists closer to redefining kilogram