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If you two copper wires in a thermostat (L=2cm), that are touching when T=28 degree Celsius to make contact to turn on the AC, how

If you two copper wires in a thermostat (L=2cm), that are touching when T=28 degree Celsius to make contact to turn on the AC, how far apart are the wires when the temperature is 10 degrees Celsius? How could you use expansion/contraction to make a switch to turn on a heater when it got cold?

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