Definition

1. Noun:
   • A unit of surface area: An "ar" is a metric unit of area equal to 100 square meters.
   • An inert gas: "Ar" is the symbol for the chemical element argon, a colorless and odorless noble gas.
   • A US state abbreviation: "AR" is the standard two-letter postal abbreviation for the state of Arkansas.

Usage Examples

• Noun (Unit of area):

  • The small garden plot was exactly one ar in size.
  • We measured the land in ares rather than square feet.

• Noun (Chemical element):

  • The light bulb was filled with ar to prevent the filament from oxidizing.
  • Ar is used in welding to create an inert atmosphere.

• Noun (US State):

  • The package was shipped to Little Rock, AR.
  • Her mailing address ended with "Fayetteville, AR 72701".

Advanced Usage

• Scientific Context: In chemistry and physics, "Ar" is consistently used as the atomic symbol for argon (atomic number 18) in formulas and periodic tables.
• Cartography and Land Measurement: The unit "ar" is primarily used in some European countries for measuring plots of land, though the hectare (100 ares) is more common.

Variants and Related Words

• Are: An alternative, more common spelling for the unit of area. "One are is equivalent to 100 square meters."
• Hectare: A larger unit of area equal to 100 ares.
• Argon: The full name of the element represented by the symbol "Ar".

Synonyms

• Unit of Area: (None that are exact synonyms; it is a specific metric unit).
• Element: Argon.
• State: Arkansas.

Related Phrases

• Per are: A phrase used in agriculture or real estate to express a rate per unit area.
  • The yield was 500 kilograms per are.

Notes on Usage

• Capitalization: When referring to the chemical element or the state, "Ar" is typically written with a capital 'A'. The unit of area is written in lowercase ("ar" or "are").
• Context is Key: The meaning of "ar" is entirely dependent on context—scientific, geographical, or related to measurement. It is rarely used in general conversation without clarifying context.

Noun

1. a state in south central United States; one of the Confederate states during the American Civil War
2. a unit of surface area equal to 100 square meters
3. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere