hg
Học thuậtThân thiện
Definition
- Noun:
- A unit of mass: The symbol 'hg' is an abbreviation for the hectogram, a metric unit of mass equal to 100 grams.
- A chemical element: The symbol 'Hg' is the chemical symbol for the element mercury.
Usage
As a unit of mass (hg): Primarily used in scientific, technical, or commercial contexts in countries that use the metric system. It is less common in everyday use than grams or kilograms.
- The recipe requires 2 hg of flour. (This means 200 grams of flour.)
- The cheese is sold by the hectogram at the deli counter.
As a chemical symbol (Hg): Used universally in chemistry, physics, engineering, and medicine to represent the element mercury.
- The thermometer contained Hg.
- Hg is the 80th element in the periodic table.
Advanced Usage
- In compound units: The hectogram can be part of larger or smaller metric units (e.g., decahectogram, centihectogram), though these are extremely rare in practice.
- In scientific notation: The symbol 'Hg' is used in chemical formulas and equations (e.g., HgO for mercury oxide).
Variants and Related Words
- Hectogram (n): The full name for the unit of mass abbreviated as 'hg'.
- Mercury (n): The common name for the chemical element with the symbol 'Hg'.
- Mercury is a liquid metal.
- Quicksilver (n): A historical or poetic synonym for the element mercury.
Synonyms
- For hg (hectogram): 100 grams, 0.1 kilogram.
- For Hg (mercury): quicksilver (archaic), hydrargyrum (Latin origin, now obsolete).
Important Note on Capitalization
- hg (lowercase): Almost exclusively refers to the unit hectogram.
- Hg (capitalized): Refers to the chemical element mercury. This distinction is critical in technical writing.
Noun
- 100 grams
- a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures