Avogadro number/constant
Avogadro constant, also known as Avogadro constant, is a thermal constant with the symbol of NA. The exact value is 6.022 14076× 10, and it is generally calculated as 6.02× 10 or 6.022× 10.
Avogadro constant is the number of atoms contained in 12g 12C. 12C was chosen as the reference material because its atomic weight can be measured quite accurately. Avogadro constant is named after Italian chemist Amedeo avogadro (1776~ 1856).
Now this constant is closely related to the quantity of matter. As the basic unit of the International System of Units (SI), the mole is defined as Avogadro constant (NA). The basic unit can be any substance (such as molecules, atoms or ions).
Knowledge expansion:
Mole is the unit to express the amount of matter, and each mole of matter contains Avon Gadereau constant particles. Mol is one of the basic units in the international system of units, which is used to express the quantity of matter, referred to as Mo, and the symbol is MOL.
197 1 The 14th International Metrology Conference stipulates: "Molar is the quantity of a material system, and the number of basic units contained in this system is equal to the number of atoms of 0.0 12kgC. When using moles, you should specify the basic unit, which can be atoms, molecules, ions, electrons and other particles, or a specific combination of these particles. "
Moore is like a bridge, connecting a single particle invisible to the naked eye with a large number of particles that can be weighed. It is very convenient to apply moles in chemical calculation.
Avogadro, an Italian natural scientist. 1776 was born in an aristocratic family in Turin on August 9, and devoted himself to legal work in his early years. 65438-0796, postdoctoral fellow in law, local official. He taught himself mathematics and physics from 1800. The first scientific paper was published in 1803. From 65438 to 0809, he was appointed as a professor of natural philosophy at Moore College.