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A modified form of an equation developed earlier by Katti and Chaudhri for binary systems Is proposed for the representation of viscosity In ternary mixtures. Results by this approach are compared with experimental data and with results predicted by use of the more complex equation of Kalidas and Laddha. The present approach Is correlated with the experimental data equally as well as Is that of Kalidas and Laddha. ACCURATE analytical viscosity-concentration functionsare essential to a solution of fluid flow problems in multicomponent systems. In addition, for purposes of theoretical interpretation, it is desirable that such equations include separately contributions from ideal mixing and terms that arise from

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Viscosities at 25°C. are presented for nine binary liquid systems of n-hexadecane with 1-chloroalkanes from 1-chlorobutane through 1-chlorooctadecane. Dependence of the excess Gibbs free energy of activation for flow and the limiting values of the corresponding partial molal properties on chain length of the 1-chloroalkane is discussed. Experimental viscosities are compared with values calculated with several different equations.ThE QUALITATIVE correlation of liquid viscosity with molecular structure has long been recognized, and viscosities