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A relatively simple relaxation theory to account for the behavior of liquids under dynamic conditions was proposed. The general dynamical equations are similar in form to the phenomenological relaxation equations used in theories of viscoelasticity, however, they differ in that all the coefficients of the present equations are expressed in terms of thermodynamic and molecular quantities. The theory is based on the concept that flow in a liquid distorts both the radial and the velocity distribution functions, and that relaxation equations describing the return of these functions to their isotropic distributions, characterizing a stationary liquid, can be written. The theory was applied to the problems of steady and oscillatory shear flows and to the propagation of longitudinal waves. In all cases classical results are predicted for strain rates, and an expression for the viscosity of a liquid, simular to the Macedo-Litovitz equation, is obtained.

1Mother Earth, Vol. 1 No. 2, April 1906

By Max Baginski, John Russell Coryell, John Davidson, Emma Goldman, Mary Hansen, Otto Erich Hartleben and I. L. Peretz

"Mother Earth was an American anarchist journal that described itself as "A Monthly Magazine Devoted to Social Science and Literature". Founded in early 1906 and initially edited by Emma Goldman, an activist in the United States, it published articles by contemporary activists and writers in Europe as well as the US, in addition to essays by historic figures." This is Volume 1 of the series. This is the second number of the magazine.