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The symbol for the planet Mercury (☿) has been used since ancient times to represent the element. Hg is the modern chemical symbol for mercury. [28] It is an abbreviation of hydrargyrum, a romanized form of the ancient Greek name for mercury, ὑδράργυρος (hydrargyros).
Hg is the modern chemical symbol for mercury. It comes from hydrargyrum , a Latinized form of the Greek word Ύδραργυρος ( hydrargyros ), which is a compound word meaning "water-silver" (hydr- = water, argyros = silver) — since it is liquid like water and shiny like silver.
For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a Neo-Latin name) because helium was not known in ancient Roman times. Some symbols come from other sources, like W for tungsten (Wolfram in German) which was not known in Roman times.
Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports , refrigeration and aviation in the United States . It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity .
There are seven stable isotopes of mercury (80 Hg) with 202 Hg being the most abundant (29.86%). The longest-lived radioisotopes are 194 Hg with a half-life of 444 years, and 203 Hg with a half-life of 46.612 days. Most of the remaining 40 radioisotopes have half-lives that are less than a day.
Planet: Mercury. Symbol: Turtle. Climate: Cold. ... These ideas around the elements and how they relate is the root of why we call fire signs feisty and water signs sensitive. Without one element ...
Mercury retrograde is an optical illusion that occurs when the planet Mercury appears to move backwards in the night sky. In reality, the Earth overtakes Mercury in its orbit, creating the illsuion.
An exclusive excerpt -- and photos -- from upcoming release 'Somebody to Love: The Life, Death and Legacy of Freddie Mercury' by Matt Richards & Mark Langthorne, published by Weldon Owen.