has dimension has unit 単位を持つ has value 値を持つ quantity 量 solid angle ruimtehoek 立体角 Solid angle is the ratio of the surface of a portion of a sphere enclosed by the conical surface that forms an angle to the square of the radius of the sphere. ω Ω solid angle unit attosteradian attosteradiaal centisteradian centisteradiaal decisteradian decisteradiaal degree squared dimensionOne femtosteradian femtosteradiaal microsteradian microsteradiaal millisteradian millisteradiaal nanosteradian nanosteradiaal picosteradian picosteradiaal second (angle) squared square metre per square metre vierkante meter per vierkante meter steradian steradiaal 球面度