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Entity > Abstract > Quantity > PhysicalQuantity > ConstantQuantity > SolidAngleMeasure > Steradian |
Steradian | ||||
subject | fact |
Steradian | documentation SI 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 = 1 | |
is an instance of SolidAngleMeasure | ||
is an instance of SystemeInternationalUnit | ||
ConstantQuantity | has axiom (=> | |
is first domain of MagnitudeFn | ||
is second domain of measure | ||
UnitOfMeasure | has axiom (=> | |
has axiom (=> | ||
has axiom (=> | ||
is second domain of MeasureFn | ||
PhysicalQuantity | is partitioned into ConstantQuantity, FunctionQuantity | |
Abstract | is disjoint from Physical |