1811,1909

Avogadro constant

• The number of particles in a mole of any element
• The number of particles in twelve grams of carbon-12
• 6.022140857 × 10²³ give or take 0.000000074 x 10²³
• In 1909, Jean Baptiste Perrin determined its value
• and named it after Amedeo Avogadro.

Related constants

• The number of atoms or molecules
• in a given volume of gas
• is the Loschmidt constant.
• The pressure times the volume of a gas
• divided by its temperature times the number of particles
• is the Boltzmann constant.
• A mole of electrons
• has an electric charge
• equal to the Faraday constant.

Macro and micro

• The Avogadro constant
• is the scaling factor
• between the atomic scale
• and the scale in which
• we appreciate things
• made of atoms.
• *
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