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Hg (Mercury) IS a liquid at room temperature. [and Mark adds...] Unless this is some kind of trick question, Hg, or Mercury, is a liquid at room temperature.

Until it was labeled as "bad", mercury was used in oral and rectal thermometers, and it is still seen in positional or gravity-driven switches. Mercury is found in some older home furnace thermostats. When connected to a spring that coils and uncoils as the temperature changes, the mercury, "floats" in a sealed glass tube that has two wires at one end. The switch, riding on the coil, will make contact as it tilts to activate the furnace.

Mercury can be ionized into a gas and used for propulsion in space.

I don't know of any uses for solid/frozen mercury.

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16y ago

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