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Entity > Abstract > Quantity > PhysicalQuantity > ConstantQuantity > SolidAngleMeasure
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SolidAngleMeasure comparison table
Subject is an instance of documentation be disjoint from be second domain of be first domain of partition into have axiom
SteradianSystemeInternationalUnitSI SolidAngleMeasure. 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 = 1PhysicalMeasureFnMagnitudeFnConstantQuantity, FunctionQuantity
(=>
(and
(instance ?REL RelationExtendedToQuantities)
(instance ?REL BinaryRelation)
(instance ?NUMBER1 RealNumber)
(instance ?NUMBER2 RealNumber)
(holds ?REL ?NUMBER1 ?NUMBER2))
(forall (?UNIT)
(=>
(instance ?UNIT UnitOfMeasure)
(holds ?REL (MeasureFn ?NUMBER1 ?UNIT) (MeasureFn ?NUMBER2 ?UNIT)))))

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