Perfect Gas Equation: PV = nRT

P: pressure, SI Unit: Pa

V: volume, SI Unit: m^{3}

n: amount of substance, SI Unit: moles

R: molar gas constant, 8.314 J/K.mol

T: thermodynamic temperature, SI Unit Kelvin

This equation is otherwise known as the Ideal Gas law. It relates the pressure and volume to the temperature and the mass of the gas. A gas that behaves according to this equation is called a perfect/ideal gas.