welding atmosphere
51argon — /ahr gon/, n. Chem. a colorless, odorless, chemically inactive, monatomic, gaseous element that, because of its inertness, is used for filling fluorescent and incandescent lamps and vacuum tubes. Symbol: Ar; at. no.: 18; at. wt.: 39.948. [1890… …
52aerospace industry — Introduction assemblage of manufacturing concerns that deal with vehicular flight within and beyond the Earth s atmosphere. (The term aerospace is derived from the words aeronautics and spaceflight.) The aerospace industry is engaged in the …
53environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
54Western sculpture — ▪ art Introduction three dimensional artistic forms produced in what is now Europe and later in non European areas dominated by European culture (such as North America) from the Metal Ages (Europe, history of) to the present. Like… …
55comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …
56Chemical reaction — Chemical reactions redirects here. For the 2007 television episode, see Chemical Reactions (Men in Trees). A thermite reaction using iron(III) oxide. The sparks …
57Construction of the Trans-Alaska Pipeline System — The construction of the Trans Alaska Pipeline System was a massive undertaking involving tens of thousands of people often in extreme temperatures and conditions. Specialized construction techniques were pioneered to build the pipeline, most of… …
58Infrared — For other uses, see Infrared (disambiguation). An image of two people in mid infrared ( thermal ) light (false color) …
59Lunar soil — Moondust redirects here. For the Commodore 64 video game, see Moondust (video game). For the Psychoactive drug, see Phencyclidine. Bootprint on lunar soil …
60carbon dioxide — a colorless, odorless, incombustible gas, CO2, present in the atmosphere and formed during respiration, usually obtained from coal, coke, or natural gas by combustion, from carbohydrates by fermentation, by reaction of acid with limestone or… …
