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Elemental mercury is traditionally used in thermometers and some electrical switches.
en.wikipedia.org It was during the worst month in that climate, with rain and snow and the thermometer at night below zero, when this retreat was made.
en.wikipedia.org They found that a mercury thermometer sprayed with ether which was then evaporated by blowing could fall to 7 degrees celsius in a warm room.
en.wikipedia.org The outdoor part of the thermometer requires some kind of remote temperature sensing device.
en.wikipedia.org It is technically an electric sign rather than a thermometer.
en.wikipedia.org