Abstract
ACCORDING to the well-known rule of Guldberg1, the normal boiling point of a liquid is two-thirds of the critical temperature on the absolute scale. The rule is not obeyed by liquids of low boiling point2, and even for liquids boiling in the range 20–250° C. the ratio T
b
/T
c varies from 0.58 to 0.70. Inasmuch as these deviations arise from the different cohesive forces, and the latter are related to the surface tension, we may write 
, where γb is the surface tension of the liquid at the boiling point, and n and k are constants. For ordinary organic liquids the relation 
is generally more accurate than the simple Guldberg rule, as may be seen from the following data: 
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References
Guldberg, C. M., Z. Phys. Chem., 5, 374 (1890). Partington, J. R., “An Advanced Treatise on Physical Chemistry”, 1, 646 (Longmans, Green and Co., Ltd., London, 1951).
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Lennard-Jones, J. E., and Corner, J., Trans. Farad. Soc., 36, 1156 (1940).
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BOWDEN, S. A Corrected Guldberg Rule. Nature 174, 613–614 (1954). https://doi.org/10.1038/174613b0
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DOI: https://doi.org/10.1038/174613b0
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