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Effect of Pressure on the Viscosity of Water


ACCURATE values for the viscosity of water at various temperatures and pressures are necessary both to the chemist, who may require to relate viscosity with other phenomena, such as electrical conduction in aqueous solutions, and to the engineer, who may require the information in the solution of heat transfer and flow problems. It has been observed that above about 33° C the viscosity of water increases with pressure, and that below this temperature, initially the pressure effect is negative but at about 1,000 kg/cm2 the viscosity relative to 1 atm. exhibits a minimum. Presumably at this pressure the structured regions occurring in water have been partially destroyed and the behaviour is more like that of a “normal” liquid.

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WONHAM, J. Effect of Pressure on the Viscosity of Water. Nature 215, 1053–1054 (1967).

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