Glowing body

Spontaneous Ignition A material proceeding without constraint by internal impulse or outside energy to kindle or set fire quick or slow oxidation or combustion brought about by chemical, electrical, biological (bacterial) or physical processes (vibration, pressure, friction) without assistance of extraneous sources of heat (flame, sparks, hot or glowing bodies). 

The dark lines in the spectrum of sunlight were produced, it seemed very likely, by absorption of the light of the glowing body of the sun by the gases of its relatively cool atmosphere. The vapors in the sun s atmosphere absorbed li t, and from the position of the resulting dark lines in the spectrum one could teU what elements were present in the sun s atmosphere. 

Test methods of flame spread comprise all the techniques where a specimen is subjected to the effect of an igniting source (flame, heat radiation, glowing body) followed by recording of the consequences of ignition. 

Brought in contact with fire or glowing bodies, dynamite even in quantities of several kilograms burns without exploding if it is not packed into too tight... 

History. The term plasma was first used by Langmuir in 1928 to describe the main body of a gas discharge (1). Use of the term reflects the Greek origin of the word, to mold. Artificially induced glowing gas discharges mold themselves to the shape of their container and to items being processed within. 

The main sources of infrared radiation used in spectrophotometers are (1) a nichrome wire wound on a ceramic support, (2) the Nernst glower, which is a filament containing zirconium, thorium and cerium oxides held together by a binder, (3) the Globar, a bonded silicon carbide rod. These are heated electrically to temperatures within the range 1200- 2000 °C when they will glow and produce the infrared radiation approximating to that of a black body. 

The New Zealand freshwater limpet Latia neritoides (Fig. 6.1.1) is the only known example of a freshwater luminous organism, with two possible exceptions certain species of luminous bacteria and the larvae of certain species of fireflies. The limpet inhabits shallow clear streams in the North Island of New Zealand, clinging to stones and rocks. Latia has a small oval-shaped shell (6-8 mm long), and secretes a luminous mucus that emits a greenish glow around the body only when disturbed the limpet does not show a spontaneous luminescence. The luminescence of Latia was first reported by Suter (1890) and further details including a positive luciferin-luciferase reaction were described by Bowden (1950). Both the luciferin and the luciferase have... 

For nineteenth-century scientists, the obvious way to account for the laws of black-body radiation was to use classical physics to derive its characteristics. However, much to their dismay, they found that the characteristics they deduced did not match their observations. Worst of all was the ultraviolet catastrophe classical physics predicted that any hot body should emit intense ultraviolet radiation and even x-rays and y-rays According to classical physics, a hot object would devastate the countryside with high-frequency radiation. Even a human body at 37°C would glow in the dark. There would, in fact, be no darkness. 

Indirect immunofluorescence assay (IFA) A laboratory test used to detect antibodies in serum or other body fluid. The specific antibodies are labeled with a compound that will make them glow a fluorescent green color when observed microscopically under ultraviolet light. 

It was fun to think about how I should dress, speak, move, and touch, to talk of type-foundries and colophons, watermarks and printers patrons, and all the time watch a mans hands, the tilt of his head, the way his mouth moved as he spoke, the way his fingers brushed mine as he put more drinks on the table. It was fun that could fill my head and then my body, that bright, dumb spark in a man s eye that made my skin shiver in response. And we were away from home, after all, it was only a week, and the sun was shining on the Venice canals, or the moon was rising from behind the Rockies, or the coal fire in my rooms was so glowing that it shut out the gray cold and the Lancashire rain, and wrapped us in warmth. 

Thus, although the colour of sparks is dependent upon flame temperature and may be similar to that of black body radiation, the overall colour effect can include contributions from atomic line emissions, from metals (seen in the UV and visible regions of the electromagnetic spectrum), from band emissions from excited oxide molecules (seen in the UV, visible and IR regions) and from continuum hot body radiation and other luminescence effects. So far as black body radiation is concerned, the colour is known to change from red (500 °C glowing cooker... 

Solder two wires to the tip and body of the glow plug. Do not allow the wires to touch. 

The traditional source in IR absorption spectroscopy is a glowing rod or wire heated by the passage of an electric current the hot body emits radiation over a continuous frequency range. The radiation is dispersed using a prism NaCl, which is transparent over much of the IR region, is commonly used for IR prisms and windows. The sample may be a solid, liquid, or gas. Various detectors are used the most common are thermocouples, photoconductive materials such as PbS, bolometers (which are temperature-dependent resistors), and the Golay cell (which uses the thermal expansion of a gas contained in a chamber). 

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