[1] The Lydersen method is the prototype for and ancestor of many new models like Joback,[2] Klincewicz,[3] Ambrose,[4] Gani-Constantinou[5] and others.
The Lydersen method is based in case of the critical temperature on the Guldberg rule which establishes a relation between the normal boiling point and the critical temperature.
Guldberg has found that a rough estimate of the normal boiling point Tb, when expressed in kelvins (i.e., as an absolute temperature), is approximately two-thirds of the critical temperature Tc.
Lydersen uses this basic idea but calculates more accurate values.
For the critical volume the following calculation results: Vc = 40 + 60.0 + 2 * 55.0 = 210 cm3 In the literature (such as in the Dortmund Data Bank) the values 215.90 cm3,[6] 230.5 cm3 [7] and 209.0 cm3 [8] are published.