"Incandescent" redirects here. For the album by Crumbächer, see Incandescent (album).
For the science fiction novel with the same name, see Incandescence (novel). For information on the intensity and spectrum (color) of incandescence, see thermal radiation.
Hot metal work glows with visible light. This thermal radiation also extends into the infrared, invisible to the human eye and the camera the image was taken with, but an infrared camera could show it (See Thermography).The incandescent metal embers of the spark used to light this Bunsen burner emit light ranging in color from white to orange to yellow to red or to blue. This change correlates with their temperature as they cool in the air. The flame itself is not incandescent, as its blue color comes from the quantized transitions that result from the oxidation of CH radicals.
In practice, virtually all solid or liquid substances start to glow around 798 K (525 °C; 977 °F), with a mildly dull red color, whether or not a chemical reaction takes place that produces light as a result of an exothermic process. This limit is called the Draper point. The incandescence does not vanish below that temperature, but it is too weak in the visible spectrum to be perceptible.
At higher temperatures, the substance becomes brighter and its color changes from red towards white and finally blue.
Incandescence is exploited in incandescent light bulbs, in which a filament is heated to a temperature at which a fraction of the radiation falls in the visible spectrum. The majority of the radiation, however, is emitted in the infrared part of the spectrum, rendering incandescent lights relatively inefficient as a light source.[3] If the filament could be made hotter, efficiency would increase; however, there are currently no materials able to withstand such temperatures which would be appropriate for use in lamps.
More efficient light sources, such as fluorescent lamps and LEDs, do not function by incandescence.[4]
Sunlight is the incandescence of the "white hot" surface of the Sun.
See alsoedit
The visible color of an object heated to incandescence (from 550°C to 1300°C (1022°F to 2372°F))
luminescence (light emission by substances not resulting from heat)
Referencesedit
^Dionysius Lardner (1833). Treatise on Heat. Longman, Rees, Orme, Brown, Green & Longman. p. 341. The state in which a heated body, naturally incapable of emitting light, becomes luminous, is called a state of incandescence.
^John E. Bowman (1856). An Introduction to Practical Chemistry, Including Analysis (Second American ed.). Philadelphia: Blanchard and Lea. p. 283. incandesce 0-1860.
^William Elgin Wickenden (1910). Illumination and Photometry. McGraw-Hill. p. 3. incandescent low-efficiency blackbody.
^Koones, Sheri (2012-10-01). Prefabulous + Almost Off the Grid: Your Path to Building an Energy-Independent Home. Abrams. ISBN9781613123966.
External linksedit
December 14, 2023
incandescence, incandescent, redirects, here, album, crumbächer, incandescent, album, science, fiction, novel, with, same, name, novel, information, intensity, spectrum, color, incandescence, thermal, radiation, emission, electromagnetic, radiation, including,. Incandescent redirects here For the album by Crumbacher see Incandescent album For the science fiction novel with the same name see Incandescence novel For information on the intensity and spectrum color of incandescence see thermal radiation Incandescence is the emission of electromagnetic radiation including visible light from a hot body as a result of its high temperature 1 The term derives from the Latin verb incandescere to glow white 2 A common use of incandescence is the incandescent light bulb now being phased out Hot metal work glows with visible light This thermal radiation also extends into the infrared invisible to the human eye and the camera the image was taken with but an infrared camera could show it See Thermography The incandescent metal embers of the spark used to light this Bunsen burner emit light ranging in color from white to orange to yellow to red or to blue This change correlates with their temperature as they cool in the air The flame itself is not incandescent as its blue color comes from the quantized transitions that result from the oxidation of CH radicals Incandescence is due to thermal radiation It usually refers specifically to visible light while thermal radiation refers also to infrared or any other electromagnetic radiation Contents 1 Observation and use 2 See also 3 References 4 External linksObservation and use editMain article Thermal radiation In practice virtually all solid or liquid substances start to glow around 798 K 525 C 977 F with a mildly dull red color whether or not a chemical reaction takes place that produces light as a result of an exothermic process This limit is called the Draper point The incandescence does not vanish below that temperature but it is too weak in the visible spectrum to be perceptible At higher temperatures the substance becomes brighter and its color changes from red towards white and finally blue Incandescence is exploited in incandescent light bulbs in which a filament is heated to a temperature at which a fraction of the radiation falls in the visible spectrum The majority of the radiation however is emitted in the infrared part of the spectrum rendering incandescent lights relatively inefficient as a light source 3 If the filament could be made hotter efficiency would increase however there are currently no materials able to withstand such temperatures which would be appropriate for use in lamps More efficient light sources such as fluorescent lamps and LEDs do not function by incandescence 4 Sunlight is the incandescence of the white hot surface of the Sun See also edit nbsp The visible color of an object heated to incandescence from 550 C to 1300 C 1022 F to 2372 F Black body radiation Red heat List of light sources luminescence light emission by substances not resulting from heat References edit Dionysius Lardner 1833 Treatise on Heat Longman Rees Orme Brown Green amp Longman p 341 The state in which a heated body naturally incapable of emitting light becomes luminous is called a state of incandescence John E Bowman 1856 An Introduction to Practical Chemistry Including Analysis Second American ed Philadelphia Blanchard and Lea p 283 incandesce 0 1860 William Elgin Wickenden 1910 Illumination and Photometry McGraw Hill p 3 incandescent low efficiency blackbody Koones Sheri 2012 10 01 Prefabulous Almost Off the Grid Your Path to Building an Energy Independent Home Abrams ISBN 9781613123966 External links edit Retrieved from https en wikipedia org w index php title Incandescence amp oldid 1187817767, wikipedia, wiki, book, books, library,
