For very low pressures θ ≈ K P {\displaystyle \theta \approx KP} , and for high pressures θ ≈ 1 {\displaystyle \theta \approx 1} .
Väga madalate rõhkude puhul θ ≈ K P {\displaystyle \theta \approx KP} ja kõrgete rõhkude puhul θ ≈ 1 {\displaystyle \theta \approx 1} .