conditioned-air emergency valve
1building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
2Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
3Thermal power station — Republika Power Plant, a thermal power station in Pernik, Bulgaria …
4international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
5Nitrous oxide — N2O redirects here. For other uses, see N2O (disambiguation). Laughing gas redirects here. For other uses, see Laughing gas (disambiguation). Not to be confused with nitric oxide (formula NO) or nitrogen dioxide (formula NO2). For other uses, see …
6nuclear reactor — Physics. reactor (def. 4). Also called nuclear pile. [1940 45] * * * Device that can initiate and control a self sustaining series of nuclear fission reactions. Neutrons released in one fission reaction may strike other heavy nuclei, causing them …
7Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
8British Rail Class 313 — A refreshed Southern Class 313 No. 313203 at Brighton on the West Coastway Line …
9List of Historic Mechanical Engineering Landmarks — The following is a list of Historic Mechanical Engineering Landmarks as designated by the American Society of Mechanical Engineers since it began the program in 1971. The designation is granted to existing artifacts or systems representing a… …
10Mercury-Redstone 4 — Mission insignia Mission statistics Mission name Mercury Redstone 4 Spacecraft name Liberty Bell 7 Spacecraft mass 1,286 …
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