Tesla (unit)

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The tesla (symbol T) is the SI derived unit of magnetic field B (which is also known as "magnetic flux density" and "magnetic induction"). The tesla is equal to one weber per square meter and was defined in 1960[1] in honor of inventor, scientist and electrical engineer Nikola Tesla. One billionth of a tesla is a nanotesla, equivalent to .01 mG or 0.01 milligauss, and it is in nanoteslas that common metric home measurements are made to determine local magnetic field exposure.

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[edit] Definition

This SI unit is named after Nikola Tesla. As with every SI unit whose name is derived from the proper name of a person, the first letter of its symbol is uppercase (T). When an SI unit is spelled out in English, it should always begin with a lowercase letter (tesla), except where any word would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase.
— Based on The International System of Units, section 5.2.

As an SI derived unit, the tesla can also be expressed as:

\mathrm{1\, T = 1\,\frac{V\cdot s}{m^2} = 1\,\frac{N}{A\cdot m} = 1\,\frac{Wb}{m^2} = 1\,\frac{kg}{C\cdot s}} = 1\,\frac{kg}{A\cdot s^2} (In SI base units)

Units used:

[edit] Conversions

1 tesla is equivalent to:

  • 10,000 (or 104) gauss (G), used in the 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)

For those concerned with low-frequency electromagnetic radiation in the home, the following conversions are needed most:

  • 1000 nanotesla = 1 microtesla = 10 milligauss (mG)
  • 1,000,000 microtesla = 1 tesla
  • 200 nanotesla = US Congress and WHO Recommended limit for constant human exposure = 2 mG

For the relation to the units of the magnetizing field (Amperes/Meter or Oersted) see the article on permeability.

[edit] Examples

Main article: Orders of magnitude (magnetic field)

[edit] References

  1. ^ sizes.com - details of SI units
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