steradian
41Lumen — A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it is Latin for light, including the light that comes through a window.… …
42Conversion of units — is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors. Contents 1 Techniques 1.1 Process 1.2 Multiplication factors …
43Radian — For other uses, see Radian (disambiguation). mrad redirects here. For millirads, see Rad (unit). An angle of 1 rad …
44SI derived unit — The International System of Units (SI) specifies a set of seven base units from which all other units of measurement are formed, by products of the powers of base units. These other units are called SI derived units, for example, the SI derived… …
45Solid angle — The solid angle, Ω , is the angle in three dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point. For instance, a small object nearby could subtend the same… …
46Nestor J. Zaluzec — Nestor J. Zaluzec[1] is an American scientist and inventor who works at Argonne National Laboratory. He invented and patented the Scanning Confocal Electron Microscope.[2][3][4][5] and the π Steradian Transmission X ray Detector for Electron… …
47Angle solide — L angle solide est le rapport entre la surface (en rose) de la projection d un objet sur une sphère et le carré du rayon de celle ci. Ici, l objet dont est mesuré l angle solide est une surface quadrilatère (en bleu). En mathématiques, en… …
48Lumen (unité) — Pour les articles homonymes, voir Lumen, lm et klm. Le lumen (du latin, lumière) est l’unité dérivée du système international utilisée pour le flux lumineux, ou puissance lumineuse. En physique, son symbole est lm. Sommaire 1 …
49Luminance — En physique, la luminance est l intensité d une source étendue dans une direction donnée, divisée par l aire apparente de cette source dans cette même direction. Ne pas confondre la luminance tout court, qui est une grandeur photométrique… …
50candela — The SI unit of luminous intensity, 1 lumen per m2; the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 W p …
