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Permeance

http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891

http://en.wikipedia.org/wiki/Permeance

\(\Lambda = \frac{1}{R_m}\), where \(R_m\) is reluctance.

\(\Lambda\)

"Permeance" is the inverse of reluctance. Permeance is a measure of the quantity of flux for a number of current-turns in magnetic circuit. A magnetic circuit almost acts as though the flux is "conducted", therefore permeance is larger for large cross sections of a material and smaller for longer lengths. This concept is analogous to electrical conductance in the electric circuit.