Comparisons between linear theories of incompressible and compressible porous media reveal two phenomena unique to phase compressibility: (1) boundary layers of fluid pressure and filtration will appear at noncontact loading surfaces in a compressible mixture, and (2) a small measure of mixture compressibility does not always imply that the transient behavior of a compressible mixture is only a small departure from that of an incompressible mixture. The relationships between the compressibility parameters of the present theory and those of Biot are given.

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