Gouy balance
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The Gouy balance is a simple technique for measuring the magnetic susceptibility of metals or metal complexes.
A long, cylindrical sample that is to be tested is suspended from a balance, partially entering between the poles of a magnet. The balance measures the apparent change in the mass of the sample as it is repelled or attracted by the region of high magnetic field between the poles [1].
This method was invented by the French scientist Louis Georges Gouy (19 February 1854 - 27 January 1926).