Contribution of H-bond vibrations to heat capacity of water |
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Authors: | Sergey V Lishchuk Nikolay P Malomuzh |
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Institution: | a Department of Mathematics, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom b Department of Theoretical Physics, Odessa National University, 2 Dvoryaskaja Street, Odessa 65026, Ukraine |
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Abstract: | The origin of the anomalously large value of the heat capacity of liquid water is discussed. Comparing the temperature dependence of the heat capacities for water with those for argon and hydrogen sulfide, we separate contributions of the translational and rotational degrees of freedom. The residual part is considered as being caused by the specific contributions of the transversal vibrations of H-bonds. The estimate for the number of H-bonds per molecule is obtained from the analysis of this contribution. This estimate is in quite good agreement with the estimates which follow from the analysis of the specific volume, heat of evaporation, and kinematic shear viscosity. |
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Keywords: | Water Heat capacity Hydrogen bonds |
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