My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.mr78rpm t1_iybzrke wrote
No, it for sure ridiculously does not.
The mysterious "bimetallic strip" consists of two pieces of metal bonded together. The metals do not expand or contract at the same rate as one another, so when the air in the room changes temperature, the bimetallic strip bends, shifting the position of the glass bulb and hence the mercury... when the mercury moves such that it connects together the two wires at the left side of the bulb, the heater comes on.
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