- Gauss (unit)
The gauss, abbreviated as G, is the cgs unit of measurement of a magnetic field B (which is also known as the "magnetic flux density", or the "magnetic induction"), named after the German mathematician and physicist Carl Friedrich Gauss. One gauss is defined as one maxwell per square centimeter; it equals 1×10−4 tesla. Because the tesla is so large in regards to everyday usage, it is common to see the strength of magnets reported in gauss.
Unit name and convention
This unit is named after Carl Friedrich Gauss. As with all units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase ("G"), but when the unit is spelled out, it should always be written in lowercase ("gauss"), unless it begins a sentence.
According to the centimeter gram second system of units (cgs), the gauss is the unit of magnetic field B, while the oersted is the unit of magnetizing field H. One tesla is equal to 104 gauss, and one ampere per meter is equal to 4π × 10−3 oersted.
The units for magnetic flux Φ, which is the integral of magnetic field over an area, are the weber (Wb) in the SI and the maxwell (Mx) in the cgs system. The conversion factor is 108, since flux is the integral of field over an area, area having the units of the square of distance, thus 104 (magnetic field conversion factor) times the square of 102 (linear distance conversion factor, i.e., centimetres per meter).
- 10−9–10−8 gauss: the human brain magnetic field
- 0.31–0.58 gauss: the Earth's magnetic field on its surface
- 25 gauss: the Earth's magnetic field in its core
- 50 gauss: a typical refrigerator magnet
- 100 gauss: a small iron magnet
- 2000 gauss: a small neodymium-iron-boron (NIB) magnet
- 15,000-30,000 gauss: a medical magnetic resonance imaging electromagnet
- 1012–1013 gauss: the surface of a neutron star
- 4×1013 gauss: the quantum electrodynamic threshold
- 1015 gauss: the magnetic field of some newly created magnetars
- 1017 gauss: the upper limit to neutron star magnetism, no known object in the universe can generate a stronger magnetic field
- ^ Bureau International des Poids et Mesures (2006). The International System of Units (SI). 8th ed.. http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf. Retrieved 2009-05-20.
- ^ Hayt, Jr., William H. (1974). Engineering Electromagnetics, Third Edition. McGraw-Hill. ISBN 0-07-027390-1
- ^ "Medical Daily: First measurement of magnetic field in Earth's core". First measurement of magnetic field in Earth's core. Medical Daily. http://www.medicaldaily.com/news/20101217/4716/first-measurement-of-magnetic-field-in-earths-core.htm. Retrieved 2010-12-17.
- ^ "How strong are magnets?". Experiments with magnets and our surroundings. Magcraft. http://www.coolmagnetman.com/magflux.htm. Retrieved 2007-12-14.
- ^ a b "Magnetars, Soft Gamma Repeaters and Very Strong Magnetic Fields". Robert C. Duncan, University of Texas at Austin. March 2003. http://solomon.as.utexas.edu/~duncan/magnetar.html#Epilog. Retrieved 2007-05-23.
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