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It is shown that the product of the isothermal compressibility ξ and surface tension Σ of a liquid near its triple point may be expected to be a fundamental length characteristic of the liquid. From experimental data on 30 liquids (including liquid metals) it is observed that while ξ and Σ separately vary by a factor of 150, the product ξΣ varies by a factor of less than 3 and is equal always to a few tenths of an angstrom unit.
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Egelstaff et al. (1970) studied this question.
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