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Thermometers

Barometers

Batteries

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Physical: Mercury is a silver metallic element that exists as a liquid at room temperature. ...Mercury is an element with atomic symbol Hg, atomic number 80, and atomic weight 200.59; a heavy, silvery-white metal, liquid at room temperature, a rather poor conductor of heat and a fair conductor of electricity.
Chemical: Mercury is a naturally occurring element known as a "heavy metal" and can be toxic to living organisms. ...Mercury has a melting point of -38.9oC, a boiling point of 357.3oC, and is the only metal to remain in liquid form at room temperature.

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https://www.chemicool.com/elements/mercury.html

https://www.canada.ca/en/environment-climate-change/services/pollutants/mercury-environment/about/chemical-properties.html

http://www.rsc.org/periodic-table/element/80/mercury

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Mercury was known to ancient Chinese and Hindus before 2000 BC and was found in tubes in Egyptian tombs dated from 1500 BC It was used to forma amalgams of other metals around 500 BC. Fun Fact: The Greeks used mercury in ointments and the Romans used it, unfortunately for those using it, in cosmetics. It was said it was discovered by the Chinese, Egyptians, and Hindus

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Chemical Element