My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.Significant-Funny-14 t1_iybltvo wrote
Reply to comment by ksquires1988 in My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. by Iain_MS
That is correct. I believe one piece of metal expands more with heat than the other, causing a flex rather than just extending very slightly
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