Perm (unit)

The perm ( unit symbol : perm or Pm ), derived from " perm eability", is a common unit of permeability of solids . A distinction is made between the so-called Metric Perm , which is used in the CGS system, and the US Perm , which is based on the Anglo-American system of measurement . The dimension of the unit corresponds to the area.

1 Metric Perm = 1.07 · 10 ⁻³ US Perm = 1.01 · 10 ⁸ Darcy = 1 = 1 cm² = 10 ⁻⁴ = 10 ⁻⁴ m² ${\displaystyle \mathrm {\tfrac {{\tfrac {\mathrm {cm} ^{3}}{s}}\ \mathrm {cm} \ \mathrm {Poise} }{\mathrm {c} m^{2}\ Barye}} }$ ${\displaystyle \mathrm {\tfrac {Pa\ s\ m\ m^{3}}{m^{2}\ Pa\ s}} }$

1 US Perm = 9.29 x 10 ² Metric Perm = 9.43 x 10 ¹⁰ Darcy = 9.29 x 10 ² cm² = 9.29 x 10 ⁻² m²

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• Horst R. Langguth and Rudolf Voigt: Hydrogeological Methods , Springer-Verlag, Berlin / Heidelberg / New York 1980, p. 23.
• Hermann Salmang and Horst Scholze: Keramik , Springer-Verlag, p. 171, Berlin / Heidelberg 2007, p. 171.
• Friedrich Harders and Sigismund Kienow: Refractories. Production, properties and use of refractory building materials , Springer-Verlag, Berlin / Heidelberg 1960, p. 66.