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steradian (Steradian)

SI solid angle measure. Symbol: sr. It is the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's radius. Another definition is: the solid angle which, having its vertex in the center of the sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere. Steradian = m^2/m^2 = 1.

Ontology

SUMO / UNITS-OF-MEASURE

Class(es)

UnitáDelSistemaInternazionaleDiMisurazione

is instance of

steradian

Superclass(es)

[tree]

is subclass of

Astratto

is subclass of

Quantitá

is subclass of

QuantitáFisica

is subclass of

QuantitáCostante

is subclass of

is subclass of

MisuraDiAngoloSolido

is subclass of

steradian

Coordinate term(s)

ampere becquerel candela celsius degree coulomb farad gram gray henry hertz joule kelvin degree lumen lux meter mole newton ohm pascal radian second duration siemens sievert tesla volt watt weber

Related WordNet synsets

steradian, sr: the unit of solid angle adopted under the System International d'Unites