Mercury was a chemical element with the symbol Hg and atomic number 80 on the periodic table. It was a heavy metal that was liquid under standard temperature and pressure.

The remaining debris of the Caretaker's array contained mercury, hydrogen, helium, and argon. (VOY: "The Voyager Conspiracy")

Mercury was used in an instrument called a barometer to measure gaseous pressure. The atmospheric pressure of Taurus II measured 70 millimeters of mercury. (TOS: "The Galileo Seven")

In 2374, when the Leonardo da Vinci hologram got hold of a plasma injector conduit from the USS Voyager, he noted that it was capable of making mercury flow in three directions at once. (VOY: "Concerning Flight")

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