How is Magnet Strength Measured?

A magnet is any object that produces its own magnetic field. The magnet strength of these objects can vary from imperceptibly weak fields to incredibly strong fields, depending on a number of characteristics. Magnets can be classed into two distinct groups: permanent magnets and electromagnets, and non-magnets can be defined as either ferromagnetic, paramagnetic, or diamagnetic. Ferromagnetic materials like iron are strongly attracted to magnets, paramagnetic materials like aluminum are only slightly attracted to magnets, and diamagnetic materials like carbon are weakly repelled by magnets.  more