Amedeo Avogadro, Jean Baptiste Perrin stoichiometry |

## Avogadro constant

The number of particles in a mole of any element
The number of particles in twelve grams of carbon-12
6.022140857 × 10^{23} give or take 0.000000074 x 10^{23}
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. * O portal to the Hidden World, Thru your glorious Lens We see the invisibly Small!

The value of the Avogadro constant is a very large number even though it’s a count of a small quantity of incredibly small things.

See also in

The book of science:Conservation of mass—Antoine LavoisierLaws of electrolysis—Michael FaradayFaraday efficiency—Michael FaradayBrownian motion—Robert Brown, Ludwig Boltzmann, Albert Einstein, Jean Baptiste PerrinReadings on wikipedia: