which unified electromagnetic units with the MKS dimensional system of units, the whole now known simply as the SI system (Système International d'unités)." In 1938, TC24 "recommended as a connecting link [from mechanical to electrical units] the permeability of free space with the value of μ0 = 4π H/m. This group also recognized that any one of the practical units already in use (ohm, ampere, volt, henry, farad, coulomb, and weber), could equally serve as the fourth fundamental unit. "After consultation, the ampere was adopted as the fourth unit of the Giorgi system in Paris in 1950." Multiples Like other SI units, the weber can modified by adding a prefix that multiplies it by a power of 10. Conversions One maxwell (Mx), the CGS unit of magnetic flux, equals 10−8 Wb Notes and references SI derived units Units of magnetic flux