A Corrected Guldberg Rule

@article{Bowden1954ACG,
  title={A Corrected Guldberg Rule},
  author={S. T. Bowden},
  journal={Nature},
  year={1954},
  volume={174},
  pages={613-614}
}
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 Tb/Tc 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… Expand
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