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Base units

Time t

second: s – The base unit of time in the International Systems of Units.

Length L

meter: m – The base unit of length in the International Systems of Units.

angstrom (ångström): Å – A metric unit of length, equal to 10^-10 m. Not that it is not part of the SI system of units, but it can be considered as part of the metric system in general.

Mass m

kilogram: kg – The base unit of mass in the International Systems of Units.

Electric current

ampere: A – The base unit of electric current in the International Systems of Units.

Thermodynamic temperature

kelvin: K – The base unit of thermodynamic temperature in the International Systems of Units.

Amount of substance

mole: mol – The base unit of amount of substance in the International Systems of Units.

Luminous intensity

candela: cd– The base unit of luminous intensity in the International Systems of Units.

Magnetism

Magnetic moment m (vector)

ampere meter squared: A · m²

electromagnetic unit: emu – Note that emu is not a unit. However, it is sometimes used to describe the strength of a magnetic moment and has the value of 10^-3 A · m². For example, some vibrating sample magnetometers (VSM) use this unit.

Magnetic field strength H

ampere per meter: A/m

Magnetic flux

Weber: Wb – The weber is a derived unit of the magnetic flux in the International System of Units. This unit is named in honor of Wilhelm Eduard Weber.

1 Wb = 1 V · s = 1 T · m² = 1 Ω · C = 1 H · A = 1 J/A = 1 (kg · m² )/( s² · A) = 1 · 10⁸ Mx

Magnetic flux density or magnetic induction B

Tesla: T – The tesla is a derived unit of the magnetic induction in the International System of Units. This unit is named in honor of Nikola Tesla.

1 T = 1 kg/( A · s²) = 1 N/(A · m) = 1 (V · s)/m² = 1 J/ (A · m²) = 1 (H ·A)/ m² = 1 Wb/m² = 1 kg/(C · s) = 1 (N · s)/(C · m)

in vacuum B = μ₀ · H