The Viscosity of Deuterium Oxide and Its Mixtures with Water at 25°C

Abstract
The viscosity, η, of 97.6 percent deuterium oxide and six more dilute mixtures with water, as well as that of nearly pure protium oxide, has been determined by comparison with ordinary water, and found to be almost but not quite a linear function of the specific gravity. The relative fluidity, Φ, has been related to the density by an equation of the type φ=1/η=1+A(Δs)+B(Δs) 2 , where (Δs) is the increase in the specific gravity over ordinary water. This equation has been found valid to 0.006 percent over the entire concentration range. Bingham's equation concerning the law of additive fluidities in binary systems, and containing but one arbitrary constant, has been tested and found valid to 0.01 percent.

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