A Corrected Guldberg Rule

  title={A Corrected Guldberg Rule},
  author={S. T. Bowden},
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
9 Citations
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