Lee–Kesler method
The Lee–Kesler method allows the estimation of the saturated vapor pressure at a given temperature for all components for which the critical pressure Pc, the critical temperature Tc, and the acentric factor ω are known. == Equations == ln P r = f ( 0 ) + ω ⋅ f ( 1 ) {\displaystyle \ln P_{\rm {r}}=f^{(0)}+\omega \cdot f^{(1)}} f ( 0 ) = 5.92714 − 6.09648 T r − 1.28862 ⋅ ln T r + 0.169347 ⋅ T r 6 {\displaystyle f^{(0)}=5.92714-{\frac {6.09648}{T_{\rm {r}}}}-1.28862\cdot \ln T_{\rm {r}}+0.169347\cdot T_{\rm {r}}^{6}} f ( 1 ) = 15.2518 − 15.6875 T r − 13.4721 ⋅ ln T r + 0.43577 ⋅ T r 6 {\displaystyle f^{(1)}=15.2518-{\frac {15.6875}{T_{\rm {r}}}}-13.4721\cdot \ln T_{\rm {r}}+0.43577\cdot T_{\rm {r}}^{6}} with P r = P P c {\displaystyle P_{\rm {r}}={\frac {P}{P_{\rm {c}}}}} (reduced pressure) and T r = T T c {\displaystyle T_{\rm {r}}={\frac {T}{T_{\rm {c}}}}} (reduced temperature).