Mole
The SI base unit for amount of substance, containing exactly 6.02214076 × 10²³ elementary entities.
Governing formula
n = m / M = N / Na
SI unit
mol
In depth
The mole scales chemical and atomic quantities to measurable lab masses. One mole of any chemical element has a mass in grams numerically equal to its atomic mass in atomic mass units (u).
Examples in the real world
One mole of water (H₂O) has a mass of approximately 18.015 grams and contains 6.022 × 10²³ water molecules.