Besarnya tekanan osmosis larutan:
\(\pi = M \:.\: R \:.\: T\)
\(\pi : \text{tekanan osmosis larutan}\)
\(M = \text{molaritas larutan} = \dfrac{n_{\text{ zat terlarut}}}{V}\)
\(R = \text{konstanta} = 0,082\)
\(T = \text{suhu mutlak larutan (K)}\)