Avogadro's number


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Related to Avogadro's number: Avogadro's constant

Avogadro's number

(ävōgä`drō) [for Amedeo AvogadroAvogadro, Amedeo, conte di Quaregna
, 1776–1856, Italian physicist, b. Turin. He became professor of physics at the Univ. of Turin in 1820. In 1811 he advanced the hypothesis, since known as Avogadro's law, that equal volumes of gases under identical conditions of pressure
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], number of particles contained in one molemole,
in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×1023 particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules.
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 of any substance; it is equal to 602,252,000,000,000,000,000,000, or in scientific notation, 6.02252×1023. For example, 12.011 grams of carbon (one mole of carbon) contains 6.02252×1023 carbon atoms, and 180.16 grams of glucose, C6H12O6, contains 6.02252×1023 molecules of glucose. Avogadro's number is determined by calculating the spacing of the atoms in a crystalline solid through X-ray methods and combining this data with the measured volume of one mole of the solid to obtain the number of molecules per molar volume.

Avogadro's number

[¦a·və¦gäd·drōz ‚nəm·bər]
(physics)
The number (6.02 × 1023) of molecules in a gram-molecular weight of a substance.
References in periodicals archive ?
The [R] is the amount of HPTC in mole L- 1 after gamma irradiation NA is Avogadro's number D is the -rays dose in kGys and 6.
We determined the concentration of particles in each lipoprotein fraction mathematically using Avogadro's number, the volume of sample measured, and the sample collection time.
Currently, Avogadro's number is rooted in the exact number of atoms present in 12 grams of the isotope carbon-12.
These solutions are described as dilutions beyond Avogadro's number, because the antigen is no longer detectable by scanning electron microscopy.
Where dhkl is the d- spacing and h, k and l are corresponding miller indices, M is the molar mass of the sample and NA is the Avogadro's number.
While detection limits of ppt and ppq for organochlorines such as PCBs and dioxins seem low, remember that Avogadro's Number is very large.