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The Gouy method is a technique used to measure the magnetic susceptibility of a substance. It involves suspending a sample of the substance in a non-uniform magnetic field and measuring the force exerted on the sample. The magnetic susceptibility is then calculated from the force and the magnetic field gradient. The Gouy method is based on the principle that a substance with a positive magnetic susceptibility will be attracted to a magnetic field, while a substance with a negative magnetic susceptibility will be repelled. The method is typically used to measure the magnetic susceptibility of solids and liquids, but it can also be used to measure the magnetic susceptibility of gases.