In our world, many materials can encourage the development of a magnetic field within it. This term permeability is used in electromagnetism field. If any magnetic or non-magnetic material is subjected to a magnetic field then it will get some amount of magnetization automatically. The amount of magnetization of a material when it is subjected to a magnetic field is called as the permeability of that particular material.
Typically it is a simple ratio of the magnetic flux density to the intensity of the magnetic field in a particular medium. Where, magnetic flux density refers to a vector quantity that measuring the strength and direction of the magnetic field. So, the permeability of a material varies with the medium used, that is if the permeability of a material is " a " when the surrounding medium is air, it is possible that the permeability becomes " b " when the surrounding medium is water. To solve the confusions regarding this issue, permeability is classified in two categories namely absolute permeability and relative permeability. The term absolute permeability refers to the permeability of a material when the surrounding medium is free air.
So, from the definition absolute permeability of a material = B / H .
Where, B is the magnetic flux density & H is the magnetic field. Being a standard value, absolute permeability is also known as the magnetic constant of free space. The standard value of the absolute permeability is equal to 4π × 10-7 Weber per ampere-meter.
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