Evans balance
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See also: Faraday balance
An Evans balance, also referred to as a Johnson-Matthey Magnetic Susceptibility Balance, is a device used to measure the magnetic susceptibility of solids and liquids.[1][2] Magnetic susceptibility is related to the force experienced by a substance inside a magnetic field. Different types of devices can be used to measure this magnetic susceptibility, modifying both the shape of the magnetic field inside as well as the method by which the force is measured.[3]
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The Evans balance measures the force on the magnet instead of the sample in the magnetic field.[4]