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单词 steradian
释义
ste·ra·di·an (stĭ-rādē-ən)
n. Abbr. sr
A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4π steradians.

[STE(REO)- + RADIAN.]
steradian
If A = r2 then solid angle Ω = 1 sr.
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更新时间:2025/3/22 10:46:49