Avogadros constant, also known as Avogadros number, is a fundamental constant in chemistry and physics that relates the number of particles in a substance to its mass. Here is what we know about Avogadros constant based on the search results:

• Avogadros number is approximately 6.022140857×10^23 mol−1.
• It tells us the number of particles in 1 mole of a substance, which could be electrons, molecules, or atoms.
• The value of Avogadros number was determined by measuring the mass of 12 grams of carbon-12 and comparing it to the mass of 1 atom of carbon-12 measured in grams.
• Avogadros constant is named after Amedeo Avogadro, an Italian chemist who proposed that equal volumes of gases at the same temperature and pressure contain the same number of molecules.
• One mole of any substance contains particles equal to Avogadros number, which may be atoms, molecules, or ions.

In summary, Avogadros constant is a number that relates the number of particles in a substance to its mass, and it is named after Amedeo Avogadro. It is a fundamental constant in chemistry and physics and is used to convert between mass and the number of particles in a substance.