About: Evans balance

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An Evans balance, also known as a Johnson-Matthey balance (after a commercial producer of the Evans balance) is a device for measuring magnetic susceptibility. Magnetic susceptibility is related to the force experienced by a substance in a magnetic field. Various practical devices are available for the measurement of susceptibility, which differ in the shape of the magnetic field and the way the force is measured. The Evans balance employs a similar sample configuration but measures the force on the magnet.

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  • An Evans balance, also known as a Johnson-Matthey balance (after a commercial producer of the Evans balance) is a device for measuring magnetic susceptibility. Magnetic susceptibility is related to the force experienced by a substance in a magnetic field. Various practical devices are available for the measurement of susceptibility, which differ in the shape of the magnetic field and the way the force is measured. In the Gouy balance there is a homogeneous field in the central region between two (flat) poles of a permanent magnet or an electromagnet. The sample, in the form of a powder in a cylindrical tube, is suspended in such a way that one end lies in the center of the field and the other is effectively outside the magnetic field. The force is measured by an analytical balance. The Evans balance employs a similar sample configuration but measures the force on the magnet. (en)
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  • An Evans balance, also known as a Johnson-Matthey balance (after a commercial producer of the Evans balance) is a device for measuring magnetic susceptibility. Magnetic susceptibility is related to the force experienced by a substance in a magnetic field. Various practical devices are available for the measurement of susceptibility, which differ in the shape of the magnetic field and the way the force is measured. The Evans balance employs a similar sample configuration but measures the force on the magnet. (en)
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  • Evans balance (en)
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