Mercury

Noun

1. A silvery-colored, toxic, metallic chemical element, liquid at room temperature, with atomic number 80 and symbol Hg. .mw-parser-output .defdate{font-size:smaller}

   "The mercury there has averaged 37.6°C, 2.3°C above the February norm."

2. A silvery-colored, toxic, metallic chemical element, liquid at room temperature, with atomic number 80 and symbol Hg. .mw-parser-output .defdate{font-size:smaller}
3. One of the elemental principles formerly thought to be present in all metals.
4. Ambient pressure or temperature (from the use of mercury in barometers and thermometers).

   "The mercury there has averaged 37.6°C, 2.3°C above the February norm."

5. Liveliness, volatility.