Publisher's Synopsis
Excerpt from The Measurement of the Permeability of Ceramic Bodies
It is necessary, in most cases, to decide on a standard pressure difference and standard dimensions for the specimens if strictly com parable results are to be obtained. This is due to the fact that the permeability of a body is not necessarily a constant, and measure ments made with different pressures may give different values.* It is also impossible, unless a great deal of experimental work has been performed, to calculate, with any accuracy, the permeability of a given specimen from that of another specimen of the same material but of different dimensions. This is due to the fact that, for most materials, the permeability is not a simple function of the dimensions of the specimens. The practice of expressing permeabilities in terms of unit cubes and unit pressure differences, when the actual measure ments were made at different pressures and with specimens of different dimensions, is apt to give very misleading results.
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