Gilbert (unit)

The gilbert (symbol: Gb) is an obsolete unit used in practical cgs and CGS-EMU systems to measure magnetomotive force.{{Cite book|title = Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins.|url = https://archive.org/details/encyclopaediasci00card_043|url-access = limited|last = Cardarelli|first = F.|publisher = Springer|year = 2003|isbn = 978-1-4471-1122-1|location = London|pages = [https://archive.org/details/encyclopaediasci00card_043/page/n36 24]}} The unit is named for English physicist William Gilbert.

Definition:

• 1 Gb = (1/4π) Bi-t

Conversion to the corresponding quantity in the SI, with the unit ampere-turn (A⋅t):

• 1 Gb ≘ (10/4π) A-turn ≈ 0.7957747 A⋅t
• 1 A-turn ≘ 4π × 10⁻¹ Gb