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by Empress of Everything Ever on March 14th, 2007

Empress of Everything Ever

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What is a Steradian? (I really don't know what this is so I am only guessing at what category it should be in....)

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  • by justme32 loves the weekends on March 15th, 2007

    justme32 loves the weekends

    The steradian (symbol: sr) is the SI unit of solid angle. It is used to describe two-dimensional angular spans in three-dimensional space, analogous to the way in which the radian describes angles in a plane. The name is partly derived from the Greek stereos for "solid".

    The steradian is dimensionless, since 1 sr = m2·m-2 = 1. It is useful, however, to distinguish between dimensionless quantities of different nature, so in practice the symbol "sr" is used where appropriate, rather than the derived unit "1" or no unit at all. As an example, radiant intensity can be measured in watts per steradian (W·sr-1).

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