Definition: Permeance is the ease with which flux can be set up in a material is measured. It is reciprocal of reluctance (S) of the material in the magnetic circuit.
It is denoted by (P) and is measured in Weber per ampere-turn (wb/AT) or Henry (H).
It is analogous to conductance in an electric circuit.
Permeance (P) = 1/ Reluctance
P = aµ0µr /l wb/AT or H