| http://www.w3.org/ns/prov#value | - The amount of extension is measured by the change in a dimension divided by the dimension itself, called the strain e = ??l/l, and the force is measured by the force divided by the area on which it acts, called the stress p = F/A. When this is properly done, the ratio of stress to strain is a constant depending only on the material, not on its shape or size.
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