Abstract
THE viscosity, η, of a fluid can be represented by1 where N is Avogadro's number; c is a packing factor; m is the mass of a molecule; k is Boltzmann's constant; Evisc. is the energy of activation of viscous flow; V is the molecular volume; ET is the sum of the potential and the kinetic energy of the molecules. We have found that ET can be expressed as the sum of the latent heat of vaporization (ΔEvap.) and a multiple of R.T (d.R.T). It has been shown2 that Evisc. equals the work of cohesion for non-associated liquids, and from this fact it was deduced that Evisc. equals the bond energy between two interacting molecules. Further, it has since been deduced that ΔEvap. = b.Evisc., where b is a factor depending on the mean co-ordination. Thus both ΔEvap. and Evisc. depend on the number of bonds per mole, formed by the interaction of the molecules.
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References
Guareschi, P., Atti Acad. Sci. Torino, Disp. 2a, 118 (1939).
Grunberg, L., and Nissan, A. H., Nature, 154, 146 (1944).
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GRUNBERG, L., NISSAN, A. Viscosity of Ordinary Liquids at High Rates of Shear. Nature 156, 241 (1945). https://doi.org/10.1038/156241a0
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DOI: https://doi.org/10.1038/156241a0
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