Ideal Gas Equation

Boyle’s Law, Charles’ Law and Avogadro’s Law can be combined to give a single equation which represents the relation between the pressure, volume and kelvin temperature of a given amount of a gas under different conditions.

V ∝ 1/p (Boyle's Law)

V ∝ T (Charles' Law)

V ∝ n (Avogadros' Law)

All the three expressions can be combined into a single expression.

V ∝ nT/p

pV ∝ nT

pV = nRT

The constant in this equation is called universal gas constant or molar gas constant, represented by R.

R = 8.314 J K^–1 mol^–1

This is known as the ideal gas equation because it holds only when gases are behaving as ideal gases.