Jan Loschmidt first measured this constant, defined as the number of atoms in 12 grams of carbon-12.
First measured using coulometry, modern measurements of this quantity use X-ray crystallography on silicon crystals. Calculated by CODATA using the electron rest mass, it equals the Faraday constant divided by the elementary charge, or the gas constant divided by the Boltzmann constant. Jan Loschmidt first measured this constant, defined as the number of atoms in 12 grams of carbon-12. With a value of about 6.02 times 10 to the 23rd power, for 10 points, name this constant, the number of molecules in a mole.
First measured using coulometry, modern measurements of this quantity use X-ray crystallography on silicon crystals.
{Avogadro's} number or constant [prompt on {6.02} × {1023}]