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×The Avogadro constant or (the Avogadro number earlier) is the number of elementary units in one mole of any substance. The Avogadro constant is denoted as *N*_{A}. It has the dimension of the reciprocal amount of substance (mol^{−1}). The approximate value of *N*_{A} is 6.022 × 10^{23} mol^{−1}. This means one mole of any substance contains 6.022 × 10^{23} elementary particles. The Avogadro constant is named after Italian scientist Amedeo Avogadro.

Avogadro's law is also known as Avogadro's hypothesis or Avogadro's principle. The law dictates the relationship between the volume of a gas to the number of molecules the gas possesses. This law like Boyle's law, Charles's law, and Gay-Lussac's law is a specific case of the ideal gas law. This law is named after Italian scientist Amedeo Avogadro. He formulated this relationship in 1811. After conducting the experiments, Avogadro hypothesized that the equal volumes of gas contain the equal number of particles.

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