Xenon Definition–noun Chemistry. | a heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe; atomic weight: 131.30; atomic number: 54. | |
From Dictionary
Light Definition–noun | 1. | something that makes things visible or affords illumination: All colors depend on light. | | 2. | Physics. | a. | Also called luminous energy, radiant energy. electromagnetic radiation to which the organs of sight react, ranging in wavelength from about 400 to 700 nm and propagated at a speed of 186,282 mi./sec (299,972 km/sec), considered variously as a wave, corpuscular, or quantum phenomenon. | | b. | a similar form of radiant energy that does not affect the retina, as ultraviolet or infrared rays. | | | 3. | the sensation produced by stimulation of the organs of sight. | | 4. | an illuminating agent or source, as the sun, a lamp, or a beacon. | | 5. | the radiance or illumination from a particular source: the light of a candle. | | 6. | the illumination from the sun; daylight: We awoke at the first light. | | 7. | daybreak or dawn: when light appeared in the east. | | 8. | daytime: Summer has more hours of light. | | 9. | a particular light or illumination in which an object seen takes on a certain appearance: viewing the portrait in dim light. | | 10. | a device for or means of igniting, as a spark, flame, or match: Could you give me a light? | | 11. | a traffic light: Don't cross till the light changes. | | 12. | the aspect in which a thing appears or is regarded: Try to look at the situation in a more cheerful light. | | 13. | the state of being visible, exposed to view,
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or revealed to public notice or knowledge; limelight: Stardom has placed her in the light. | | 14. | a person who is an outstanding leader, celebrity, or example; luminary: He became one of the leading lights of Restoration drama. | | 15. | Art. | a. | the effect of light falling on an object or scene as represented in a picture. | | b. | one of the brightest parts of a picture. | | | 16. | a gleam or sparkle, as in the eyes. | | 17. | a measure or supply of light; illumination: The wall cuts off our light. | | 18. | spiritual illumination or awareness; enlightenment. | | 19. | Architecture. | a. | Also called day. one compartment of a window or window sash. | | b. | a window, esp. a small one. | | | 20. | mental insight; understanding. | | 21. | lights, the information, ideas, or mental capacities possessed: to act according to one's lights. | | 23. | Archaic. the eyesight. | –adjective | 24. | having light or illumination; bright; well-lighted: the lightest room in the entire house. | | 25. | pale, whitish, or not deep or dark in color: a light blue. | | 26. | (of coffee or tea) containing enough milk or cream to produce a light color. | –verb (used with object) | 27. | to set burning, as a candle, lamp, fire, match, or cigarette; kindle; ignite. | | 28. | to turn or switch on (an electric light): One flick of the master switch lights all the lamps in the room. | | 29. | to give light to; furnish with light or illumination: The room is lighted by two large chandeliers. | | 30. | to make (an area or object) bright with or as if with light (often fol. by up): Hundreds of candles lighted up the ballroom. | | 31. | to cause (the face, surroundings, etc.) to brighten, esp. with joy, animation, or the like (often fol. by up): A smile lit up her face. Her presence lighted up the room. | | 32. | to guide or conduct with a light: a candle to light you to bed. | –verb (used without object) | 33. | to take fire or become kindled: The damp wood refused to light. | | 34. | to ignite a cigar, cigarette, or pipe for purposes of smoking (usually fol. by up): He took out a pipe and lighted up before speaking. | | 35. | to become illuminated when switched on: This table lamp won't light. | | 36. | to become bright, as with light or color (often fol. by up): The sky lights up at sunset. | | 37. | to brighten with animation or joy, as the face or eyes (often fol. by up). | —Idioms | 38. | bring to light, to discover or reveal: The excavations brought to light the remnants of an ancient civilization. | | 39. | come to light, to be discovered or revealed: Some previously undiscovered letters have lately come to light. | | 40. | hide one's light under a bushel, to conceal or suppress one's talents or successes. | | 41. | in a good (or bad) light, under favorable (or unfavorable) circumstances: She worshiped him, but then she'd only seen him in a good light. | | 42. | in (the) light of, taking into account; because of; considering: It was necessary to review the decision in the light of recent developments. | | 43. | light at the end of the tunnel, a prospect of success, relief, or redemption: We haven't solved the problem yet, but we're beginning to see light at the end of the tunnel. | | 44. | see the light, | a. | to come into existence or being. | | c. | to begin to accept or understand a point of view one formerly opposed: Her father was opposed to her attending an out-of-town college, but he finally saw the light. | | | 45. | shed or throw light on, to clarify; clear up: His deathbed confession threw light on a mystery of long standing. | |
From Dictionary
Related topics from Britannicaxenon
chemical element, a heavy and extremely rare gas of Group 18 (noble gases) of the periodic table. It was the first noble gas found to form true chemical compounds. More than 4.5 times heavier than ...
optics
Many types of optical instruments form images by natural light, but some, such as microscopes and projectors, require a source of artificial light. Tungsten filament lamps are the most common, but if ...
radiation
Life could not exist on Earth without light from the Sun. Plants utilize the energy of the Sun's rays in the process of photosynthesis to produce carbohydrates and proteins, which serve as basic ...
noble gas
Xenon has the most extensive chemistry in Group 18 and exhibits the oxidation states +12, +2, +4, +6, and +8 in the compounds it forms. Since the discovery of noble-gas reactivity in 1962, xenon ...
Physical Sciences
Chemists missed the mark when they picked the original name-inert gases-for a family of six elements that compose group 18 of the periodic table. They thought that helium, neon, argon, krypton, ...
motion-picture technology
Projectors. The projector is the piece of motion-picture equipment that has changed the least. Manufacturers produce models virtually identical to those of the 1950s, and even the 1930 model Super ...
Mathematics and Physical Sciences
Gold is somewhat unusual among its neighbours in the periodic table of elements. Whereas the transition metals platinum and palladium, for instance, have become important industrial catalysts, gold ...
photosensitization
the process of initiating a reaction through the use of a substance capable of absorbing light and transferring the energy to the desired reactants. The technique is commonly employed in ...
Edgerton, Harold E.
American electrical engineer and photographer who was noted for creating high-speed photography techniques that he applied to scientific uses.flash lamp
any of several devices that produce brief, intense emissions of light useful in photography and in the observation of objects in rapid motion. |
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