My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.nayhem_jr t1_iya9bjk wrote
Reply to comment by Kurotan 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
Thermocouples measure voltage across a material that is sensitive to temperature, same thing that digital thermometers use. This allows for much more precision and faster response than that old bimetallic switch.
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