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In mechanics, a moment is a measure of the turning effect of a force about some point in space. In most practical examples, moments are the results of forces acting at a distance from the point of interest. The stress on the body on which the force acts is then symmetric. If the moment results from a strong 'body force', such as that produced in a magnetic material in a strong magnetic field, the stress tensor is non-symmetric.

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Reference

Reference

★ Fung, Y.C, ''Foundations of Solid Mechanics'', Prentice-Hall (1965)