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 19601 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.

Contents

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:

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.

Examples

Main article: Orders of magnitude (magnetic field)

References

  1. ^ sizes.com - details of SI units

Wikipedia content modification information:

  • This page was last modified on 17 November 2008, at 15:47.

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