<Dl> <Dd> − R T ln ⁡ (γ v x v) = ∫ p p + Π V (p ′) d p ′ (\ displaystyle - RT \ ln (\ gamma _ (v) x_ (v)) = \ int _ (p) ^ (p+ \ Pi) \! V (p') \, \ mathrm (d) p'). </Dd> </Dl> <Dd> − R T ln ⁡ (γ v x v) = ∫ p p + Π V (p ′) d p ′ (\ displaystyle - RT \ ln (\ gamma _ (v) x_ (v)) = \ int _ (p) ^ (p+ \ Pi) \! V (p') \, \ mathrm (d) p'). </Dd> <P> If the liquid is incompressible the molar volume is constant, V (p ′) ≡ V (\ displaystyle V (p') \ equiv V), and the integral becomes Π V (\ displaystyle \ Pi V). Thus, we get </P> <Dl> <Dd> Π = − (R T / V) ln ⁡ (γ v x v) (\ displaystyle \ Pi = - (RT / V) \ ln (\ gamma _ (v) x_ (v))). </Dd> </Dl>

What concentration unit is necessary for the calculation of osmotic pressure