# Tesla (unit)

The tesla (symbol T) is the SI derived unit of magnetic field (specifically magnetic flux density). The tesla is equal to one weber per square metre and was defined in 1960[1] in honor of inventor, scientist and electrical engineer Nikola Tesla.

## Definition

${\displaystyle \mathrm {1\,T=1\,{\frac {V\cdot s}{m^{2}}}=1\,{\frac {N}{A\cdot m}}=1\,{\frac {Wb}{m^{2}}}=1\,{\frac {kg}{A\cdot s^{2}}}=1\,{\frac {kg}{C\cdot s}}} }$

## Conversions

1 tesla is equivalent to:

• 10,000 (or 104) gauss (G), used in CGS system. Thus, 10 G = 1 mT (1 millitesla)
• 1,000,000,000 (or 109) gammas (γ), used in geophysics. Thus, 1 γ = 1 nT (nanotesla)