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TRIZ 40 Principles
Creative tools > TRIZ Contradiction Analysis > Principles
37. Thermal expansion
When you heat things up, they usually expand at varying rates. This can either be a problem that you need to handle or it can be a tool to solve problems. The bimetallic strip is a simple example where two connected metal strips, each of which expands at a different rate, resulting in a device which bends when it is heated, thus giving the basis of many thermostats and thermometers.