Avogadro's Law
The law stating that equal volumes of all ideal gases at the same temperature and pressure contain equal numbers of molecules.
Governing formula
V1 / n1 = V2 / n2 (at constant P, T)
SI unit
m³/mol
In depth
Under standard temperature and pressure (STP: 273.15 K, 1 atm), one mole of any ideal gas occupies a molar volume of approximately 22.414 Liters.
Examples in the real world
Blowing air into a flexible lung or balloon, where adding twice as many moles of gas doubles the inflated volume.