Definition

1. Noun:
   • A fundamental principle in chemistry and physics: Avogadro's hypothesis states that equal volumes of all gases, when measured at the same temperature and pressure, contain an equal number of molecules.

Usage

• This principle is a cornerstone of gas law calculations and stoichiometry.
• It is used to relate the volume of a gas to the amount of substance (number of molecules or moles).
• The hypothesis is valid for ideal gases and provides a basis for understanding molar volume.

Examples

• Noun:
  • Avogadro's hypothesis allows chemists to determine the molecular formula of a gaseous compound.
  • According to Avogadro's hypothesis, one liter of hydrogen and one liter of oxygen at the same temperature and pressure contain the same number of molecules.

Advanced Usage

• "To apply Avogadro's hypothesis": To use this principle in a calculation or logical deduction.
  • We can apply Avogadro's hypothesis to find the volume of gas produced in the reaction.
• The hypothesis directly leads to the concept of Avogadro's constant (the number of particles in one mole of a substance).

Variants and Related Words

• Avogadro's law: Often used interchangeably with Avogadro's hypothesis, especially after it was confirmed experimentally and became an accepted law.
• Avogadro's number: The number of constituent particles (usually atoms or molecules) in one mole of a substance, approximately 6.022 × 10²³.
• Molar volume: The volume occupied by one mole of a substance (especially a gas) at a given temperature and pressure, a direct consequence of Avogadro's hypothesis.

Synonyms

• Avogadro's law: The principle, now established as a law.
• Avogadro's principle: Another common term for the same concept.

Related Concepts (Not Phrasal Verbs or Idioms)

• Ideal gas law: A fundamental equation (PV = nRT) that incorporates Avogadro's hypothesis along with other gas laws.
• Stoichiometry: The calculation of reactants and products in chemical reactions, which relies on concepts derived from Avogadro's hypothesis.

Noun

1. the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules