This paper considers the derivation of the constitutive equation of the isotropic Stokesian fluid from the general constitutive equation of the isotropic first-order stress-rate hygrosteric fluid [1] on the basis that the Stokesian fluid is the limiting case of the hygrosteric fluid as the natural time of the latter tends to zero. One suggests the hypofluent liquid as a close approximation to the general first-order, stress-rate hygrosteric fluid. More general than the linear fluent body introduced by Noll [1], the hypofluent liquid possesses a constitutive equation allowing relatively easy application to flows of simple geometry for which experimental data may be obtained.

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