Abstract
Equations have been derived expressing the conditions of equilibrium for a strained solid absorbent in contact with fluid absorbates. The results are more general than any previously derived and are not limited to infinitesimal strains or isotropic absorbents; it is necessary that the principal axes of stress and of strain coincide. The results are applied to a few cases involving various states of strain in fibrous absorbents such as might be encountered in the textile industry. One result was obtained which was uniquely different from the usual thermodynamic relations involving hydrostatic pressure. Essentially, three different forms of Gibbs free energy appear. These differ in accordance with the way in which the extensive variable for the absorbent was defined.

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