The steradian (symbol: sr) or square radian is the unit of solid angle in the International System of Units (SI). It is used in three dimensional geometry...

radiant intensity is the watt per steradian (W/sr), while that of spectral intensity in frequency is the watt per steradian per hertz (W·sr−1·Hz−1) and that...

solid angle is expressed in a dimensionless unit called a steradian (symbol: sr). One steradian corresponds to one unit of area on the unit sphere surrounding...

quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd) Irradiance...

the candela as 1 lm = 1 cd·sr. A full sphere has a solid angle of 4π steradians, so a light source that uniformly radiates one candela in all directions...

neutrinos and other particles. The SI unit of radiance is the watt per steradian per square metre (W·sr−1·m−2). It is a directional quantity: the radiance...

which includes two dimensionless derived units, the radian (rad) and the steradian (sr). Some other units such as the hour, litre, tonne, bar, and electronvolt...

the watt per steradian per square metre per hertz (W·sr−1·m−2·Hz−1) and that of spectral radiance in wavelength is the watt per steradian per square metre...

derived unit except the coulomb, ohm, siemens, gray, sievert, radian, and steradian have values that are implicitly defined by the properties of the caesium-133...

compact fluorescent. The lumen is defined as amount of light given into one steradian by a point source of one candela strength; while the candela, a base SI...