Avogadro number

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Definition
  1. Noun:
    • A fundamental physical constant: The Avogadro number is the number of constituent particles (usually atoms or molecules) contained in one mole of a substance. It is a fixed numerical value used in chemistry and physics to bridge the atomic and macroscopic scales.
Usage
  • The Avogadro number is used to convert between the number of particles and the amount of substance in moles.
  • It is a key constant in stoichiometric calculations in chemistry.
Examples
  • Noun:
    • The value of the Avogadro number is approximately 6.022 × 10²³.
    • To find the number of atoms, multiply the number of moles by the Avogadro number.
Advanced Usage
  • "Avogadro constant": This term is often used interchangeably with "Avogadro number" in modern scientific contexts, though the constant technically has the unit mol⁻¹.
    • The Avogadro constant is a fundamental scaling factor between the micro and macro worlds.
Variants and Related Words
  • Avogadro's constant: Another name for the Avogadro number, emphasizing its nature as a physical constant.
  • Mole: The unit of measurement for amount of substance, defined by the Avogadro number.
  • Loschmidt constant: A related constant representing the number of particles per unit volume of an ideal gas at standard conditions, historically connected to Avogadro's work.
Synonyms
  • Avogadro's constant
  • Nₐ (the standard symbol for the Avogadro constant)
Related Phrases
  • "Per mole": A phrase used with the Avogadro constant to denote a quantity divided by one mole.
    • The molar volume is 22.4 liters per mole at standard temperature and pressure.
Noun
  1. the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)

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