Definition
An older common name for the chemical element mercury, a heavy, silver-colored metal that is liquid at room temperature.
Plain English
Quicksilver is just another name for mercury — the silvery liquid metal you might recognize from older thermometers and barometers.
Context Anchor
Seen in older aircraft maintenance, instrument, and weather discussions involving mercury barometers or pressure measurement.
Derivation
From Old English 'cwicseolfor,' meaning 'living silver.' 'Quick' here means 'alive' or 'moving' (the same sense as in 'the quick and the dead'), and 'silver' refers to the metal's appearance. The name fits because mercury looks like silver that moves on its own — it flows and beads up like a living thing.
Why Pilots Care
Pilots read altimeter settings in 'inches of mercury' (inHg). Knowing that quicksilver and mercury are the same substance prevents confusion when reading older texts, manuals, or weather references.
Intuition Check
Quicksilver does not mean “fast silver” in aviation texts. It is simply another name for mercury, the liquid metal used in some older pressure instruments.
Example Sentence 1
The old aircraft barometer used a column of quicksilver to indicate atmospheric pressure.
Example Sentence 2
Many Quicksilver models are popular because they are easy to assemble and maintain.