My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.RadBadTad t1_iya8s9i 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
Modern thermometers use a variety of different methods and sensors to determine the temperature, but some of them include, thermocouples, Resistance Temperature Detectors (RTDs), thermistors, and Solid State sensors. These all use the ideas of voltage, resistance, and current to determine what the ambient temperature is.
The technology is a lot more complex than something like a bimetallic spring and some mercury, but if you're interested there is good reading about it!
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