23.' name='description'> Avogadro's number - definition and meaning
Avogadro's number love

Avogadro's number


from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The number of items in a mole, approximately 6.0221 × 1023.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry, physics The number of atoms present in 0.012 kilograms of isotopically pure Carbon-12, being 6.0221415 x 1023. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)


from Wiktionary, Creative Commons Attribution/Share-Alike License

Named after Amadeo Avogadro (1776 - 1856)


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  • "Celebrated annually on October 23 from 6:02 a.m. to 6:02 p.m., Mole Day commemorates Avogadro's Number (6.02 x 1023), which is a basic measuring unit in chemistry. Mole Day was created as a way to foster interest in chemistry. Schools throughout the United States and around the world celebrate Mole Day with various activities related to chemistry and/or moles.

    For a given molecule, one mole is a mass (in grams) whose number is equal to the molar mass of the molecule. For example, the water molecule has a molar mass of 18, therefore one mole of water weighs 18 grams. Similarly, a mole of neon has a molar mass of 20 grams. In general, one mole of any substance contains Avogadro's Number of molecules or atoms of that substance. This relationship was first discovered by Amadeo Avogadro (1776-1858) and he received credit for this after his death."

    "I pledge allegiance to the mole, and to the science from which it comes, one SI unit, extremely divisible, with micromoles and millimoles for all."

    July 15, 2015