My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.ftminsc t1_iybcja0 wrote
Since it’s been covered, I’ll just add that based on the coefficient of thermal of expansion of mercury, a 10mm blob of mercury at 60F will become a 10.003mm blob of mercury at 70F. So while you could design a thermostat based on thermal expansion of a mercury blob, it would have to be seriously precise, and resistant to arcing.
Iain_MS OP t1_iybr9ai wrote
Neat!
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