If a piece of soft iron is placed between the pole pieces of a magnet (as shown in below figure), it is observed that the lines of force will be concentrated into it, as if it is easier for them to pass through the soft iron piece than through the surrounding air.
In scientific language this fact is expressed by saying that iron is more permeable or has greater permeability than air.
It means that magnetic resistance of air is more than iron.
The fact that iron is more permeable than air leads us to another definition of relative permeability, "the conducting power of a substance for lines of magnetic force as compared with air."
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