The SI unit of magnetic flux density, named after a Serbian-American inventor, is the tesla.
The tesla, symbol T, measures magnetic flux density, also called the magnetic B-field. It is an SI derived unit equal to one weber per square metre. In base units, 1 T equals 1 kilogram per ampere-second squared. A charged particle moving through a one-tesla field can experience a force described by the Lorentz force law.
The unit honours Nikola Tesla, the Serbian-American inventor and electrical engineer whose work included alternating-current power systems, induction motors, and high-voltage experiments. The name was officially adopted in 1960 by the General Conference on Weights and Measures, following a proposal by Slovenian electrical engineer France Avčin.
A common mix-up is confusing magnetic flux density with magnetic field strength. Flux density is measured in teslas, while magnetic flux itself is measured in webers. In older cgs-based usage, gauss is another unit of magnetic flux density; 1 tesla equals 10,000 gauss.