Temperature Dependence Of Viscosity

All fluid properties are dependent upon temperature. For most fluids the viscosity is the property that is most sensitive to temperature changes.

A. Liquids

For liquids, as the temperature increases, the degree of molecular motion increases, reducing the short-range attractive forces between molecules and lowering the viscosity. The viscosity of various liquids is shown as a function of temperature in Appendix A. For many liquids, this temperature dependence can be represented reasonably well by the Arrhenius equation:

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