立りっ体たい角かく密みつ度ど

noun

radiance; sterance; radiant sterance

Technical term in optics and radiometry. Refers to the radiant flux emitted, reflected, transmitted, or received by a surface, per unit solid angle per unit projected area. The term 'radiance' is the most common English equivalent; 'sterance' and 'radiant sterance' are less common alternatives.

• 立りっ体たい角かく密みつ度どは放ほう射しゃ測そく定ていの基き本ほん的てきな量りょうである。

  Radiance is a fundamental quantity in radiometry.