My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.armerdan t1_iyb86y6 wrote
Reply to comment by iwillneverreadthiscr 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
You are correct. The Mercury is just the switch, the thermometer is a coiled bimetallic strip.
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