Gas laws are mathematical expressions that describe the relationships between physical properties of a gas. These properties include pressure, volume, temperature and the amount of substance (number of moles).
The discovery of gas laws at the end of the 18th century revolutionises our understanding of the behaviour of gases. In subsequent articles, we shall discuss four gas laws, namely, Boyle’s law, Charles’ law, Gay-Lussac’s law and Avogadro’s law, all of which combine to give the Ideal gas law.