Abstract
The classical Rayleigh's equation for the calculation of the surface tension of a liquid from its capillary rise height, which was derived 80 years ago, is refined on the basis of the quasi-expansion technique proposed by the author. The resulting high-precision equation enables experiments to be conducted using tubes with a dimensionless diameter (the Laplace capillary constant being the scaling unit) up to ca. 1.78. In the case of water this corresponds to a diameter of ca. 6.86 mm.
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