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)