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Degaussing
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{{Short description|Process of decreasing or eliminating a remnant magnetic field}} {{distinguish|Degassing}} {{Use dmy dates|date=October 2022}} '''Degaussing''', or '''deperming''', is the process of decreasing or eliminating a remnant [[magnetic field]]. It is named after the [[Gauss (unit)|gauss]], a unit of [[magnetism]], which in turn was named after [[Carl Friedrich Gauss]]. Due to [[magnetic hysteresis]], it is generally not possible to reduce a magnetic field completely to zero, so degaussing typically induces a very small "known" field referred to as bias. Degaussing was originally applied to reduce ships' magnetic signatures during [[World War II]]. Degaussing is also used to reduce magnetic fields in tape recorders and [[cathode-ray tube]] displays, and to destroy data held on [[magnetic storage]].
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