steradian (unit)
[/stəˈreɪdiən/]
nounmasculinepl: steradians / steradianos
esterradiano
1. The SI unit of solid angle, equal to the solid angle subtended at the center of a sphere by an area on the surface equal to the square of the sphere's radius
A complete sphere has a solid angle of 4π steradians.
Uma esfera completa tem um ângulo sólido de 4π esterradianos.
2. A measure of how large an object appears to an observer at a given distance, used in photometry and radiation measurements
The steradian is essential for calculating luminous intensity in candelas.
O esterradiano é essencial para calcular a intensidade luminosa em candelas.
The steradian is a fundamental SI derived unit used globally in physics, astronomy, and engineering. It is particularly important in photometry and radiometry. Both Brazilian and European Portuguese use the term 'esterradiano,' which is a direct transliteration of the English term, reflecting the international standardization of scientific nomenclature.
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