How is this different than the flux density expressed in gauss or tesla? Why are there 2 different units? Are they the same thing? It is commonly expressed in amperes/meter (A/m) or oersted (Oe). There's another, somehow different unit for field strength. The magnetic field diagrams here at use color to indicate the strength of the flux density.The average flux density here on the surface of the earth is about 0.5 gauss, though it varies from 0.22 to 0.6 gauss.We measure field strength with a magnetometer, expressed in gauss.We use flux density to describe the "field strength" at some distance from a magnet, used in our Pull Force Calculator and in the formulas given in our Surface Fields article.We use flux density to express Surface Field.Technically, we should probably use the term, "magnetic flux density," though it's much more commonly called, "field strength." Here's a confusing part: Many people call this, "field strength." We often refer to field strength in gauss. The conversion between gauss and tesla is an easy one: 1 tesla = 10,000 gauss. By definition, 1 weber per square meter (Wb/m 2) = 1 tesla (T). In fact, webers per square meter is the unit for flux density. Flux Density is a measure how many webers are squeezed into some area. Unlike Magnetic Flux above, the Flux Density defines some size for the loop of wire in that example. In the equations from our Surface Fields article, we use a "B" to denote this term. This property is also referred to as the B field. The SI unit for flux density, or induction, is the tesla (T).
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