Overview#
Mole (mol) is the SI Base Unit of "amount of substance"Where the "amount of substance" n in a given sample of matter is defined as the quantity or number of discrete atomic-scale particles in it divided by the Avogadro constant NA. The particles or entities may be molecules, atoms, ions, electrons, or other, depending on the context, and should be specified (e.g. amount of sodium chloride nNaCl).
The value of the Avogadro Constant The mole (symbol: mol) is a unit of amount of substance in the International System of Units, defined by fixing the Avogadro constant at the given value.
For example, if beaker A contains 10 Moles of water and beaker B contains 10 Moles of mercury, they contain equal amounts of substance and beaker B contains exactly 1 atom of mercury for each molecule of water in beaker A, despite the 2 beakers containing different volumes and very different masses of liquid.
