Space permeability, usually denoted by the symbol mu-zero, is the fundamental measure of the resistance a vacuum offers against the formation of magnetic field lines. It links electrical current to the magnetic field it produces. In practical engineering, the permeability of air is treated as identical to a vacuum, serving as the baseline multiplier for high-permeability core materials like silicon steel.
Heard on the job
When calculating the air gap flux density, we just use the space permeability constant since the gap has no iron.
Also heard as
- permeability of free space
- magnetic constant