Sr as an abbreviation is senior; a title used after a father's name when his son is given the same name. while Steradian as a noun is in the international system of units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. symbol: sr
Part of speech: abbreviation
Definition: Senior; A title used after a father's name when his son is given the same name.
Part of speech: noun
Definition: In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. Symbol: sr
We hope you now know whether to use Sr or Steradian in your sentence.