Appendix A—Progress report of the subcommittee on permeability

A variety of units and names of units relating to permeability have been used and are being used by different investigators. This Sub‐Committee was recently organized to provide an open forum for persons of different background and experience to present their views in an orderly manner. Thirteen members representing diverse fields of activity have been chosen. To these, L. K. WENZEL, Chairman, by memorandum dated December 2, 1943, proposed three questions for consideration as an initial effort of the Sub‐Committee: (1) Should the coefficient of permeability depend only on the structure of the material, or should some other name be used to express this property in view of the fact that, as now generally used, the coefficient of permeability is not independent of properties of the fluid or the combined properties of the fluid and the material; (2) should a name be coined, or is there a suitable one in existence, for expressing the combined properties of the material and fluid for practical application in one local area; (3) what are the parameters that should be included in the equation of flow of fluids that relate only to the structure of the material.