(1) Magnetic field and magnetic lines of force : Space around a magnetic pole or magnet or current carrying wire within which it's effect can be experienced is defined magnetic field. Magnetic field may be presented with the help of a set of lines or curves called magnetic lines of force.
(2) Magnetic flux (Φ) and flux density (B)
(i) The number of magnetic lines of force passing normally through a surface is defined as magnetic flux (f). It's S.I. unit is weber (wb) and CGS unit is Maxwell.
Remeber 1 wb = 108 maxwell.
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(ii) When a piece of a magnetic substance is placed in an external magnetic field the substance converts into magnetised. The number of magnetic lines of induction inside a magnetised substance crossing unit area normal to their direction is called magnetic induction or magnetic flux density It is a vector quantity.
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It's SI unit is Tesla which is same to 
and CGS unit is Gauss. Remember 1 Tesla = 104 Gauss.
(3) Magnetic permeability: It is the degree or extent to which magnetic lines of force can enter a substance and is denoted by μ. OR
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Characteristic of a medium which allows magnetic flux to pass through it is called it's permeability. e.g. permeability of hard iron is 1000 times greater than that of air.
Also μ = where absolute permeability of air or free space =
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and Related permeability of the medium = 
(4) Intensity of magnetizing field (magnetizing field) : It is the degree or extent to which a magnetic field can magnetism a atom. Also H = B/μ.
It's SI unit is 
It's CGS unit is Oersted. Also 1oersted = 80 A/m
(5) Intensity of magnetization (I) : It is the degree to which a substance is magnetized when placed in a magnetic field.
It can also be defined as the pole strength per unit cross sectional area of the substance or the induced dipole moment per unit volume.
Hence I=m/A It is a vector value, its S.I. unit is Amp/m.
(6) Magnetic susceptibility (cm) : It is the property of the substance which shows how easily a substance can be magnetized. It may also be described as the ratio of intensity of magnetization (I) in a substance to the magnetic intensity (H) applied to the substance, i.e.
. It is a scalar quantity with no units and dimensions.
7) Relation between permeability and susceptibility: Total magnetic flux density B in a material is the sum of magnetic flux density in vacuum produced by magnetizing force and magnetic flux density due to magnetization of material . i.e.
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