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Measuring weight with a strain gauge A strain gauge is a wire which is used to measure strain by the change in its resistance when it gets either longer and thinner or shorter and thicker. They are attached to a surface for which the strain is wanted, and need to be able to move as if they are part of the surface. Modern strain gauges are etched onto foil because its thin and flexible, and therefore able to move with the surface. Gauges are glued onto the test object with superglue so that they move as if they are a part of the object. Elastic modulus = stress/strain (When stress is a linear tensile or compressive stress, the elastic modulus is called Young's modulus). A tensile strain will be accompanied by a reduction (and compressive strain by an increase) in lateral dimensions. The ratio of the lateral strain...

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