sr

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Definition
  1. Noun:
    • The unit of solid angle adopted under the Systeme International d'Unites: "sr" is the abbreviation for the steradian, the SI unit for measuring solid angles.
    • A soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite: "Sr" is the chemical symbol for the element strontium.
Usage Examples

  • Noun (Unit of Measurement):

    • The solid angle subtended by a sphere at its center is 4π sr.
    • The luminous intensity is measured in candela per steradian (cd/sr).

  • Noun (Chemical Element):

    • Sr-90 is a radioactive isotope of strontium.
    • The compound contains atoms of Sr and O.
Advanced Usage
  • In scientific contexts: "sr" is almost exclusively used in technical writing, particularly in physics, mathematics, and engineering, to denote the steradian.
  • In chemical formulas and notation: "Sr" is used in chemical equations, periodic tables, and material science to represent the element strontium.
Variants and Related Words
  • Steradian (n): The full name for the unit "sr".
  • Strontium (n): The full name for the element "Sr".
Synonyms
  • For the unit: There is no direct synonym for "steradian" as it is a specific SI unit.
  • For the element: There is no synonym for the element "strontium".
Notes on Usage
  • Capitalization: The unit "sr" (steradian) is written in lowercase. The chemical symbol "Sr" (strontium) is written with a capital 'S' and lowercase 'r'.
  • Context is critical: The meaning is entirely dependent on the surrounding text. In a physics paper, "sr" likely means steradian. In a chemistry text, "Sr" likely means strontium.
  • It is an abbreviation/symbol: "sr" is not a typical word but a scientific symbol or abbreviation. It is not used in everyday conversation.
Noun
  1. the unit of solid angle adopted under the Systeme International d'Unites
  2. a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite

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