Symbol Φ. A measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. The flux dΦ through an element of area dA perpendicular to B is given by dΦ=BdA. The SI unit of magnetic flux is the weber.
Geology and Earth Sciences
The magnetic induction, perpendicular to the surface area of a nearby body, multiplied by the area of the body.