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sulfuric acid

(Encyclopedia)sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. Although sulfuric acid is now one of the most widely used c...

airship

(Encyclopedia)airship, an aircraft that consists of a cigar-shaped gas bag, or envelope, filled with a lighter-than-air gas to provide lift, a propulsion system, a steering mechanism, and a gondola accommodating pa...

tank, military

(Encyclopedia)tank, military, armored vehicle having caterpillar traction and armed with machine guns, cannon, rockets, or flame throwers. The tank, together with the airplane, opened up modern warfare, which had b...

magnetic levitation

(Encyclopedia)magnetic levitation or maglev măgˈlĕv [key], support and often propulsion of objects or vehicles by the use of magnets. The magnets used in magnetic levitation suspend an object free of contact wit...

lighthouse

(Encyclopedia)lighthouse, towerlike structure erected to give guidance and warning to ships and aircraft by either visible or radioelectrical means. Lighthouses were long built to conform in structure to their geog...

maple

(Encyclopedia)maple, common name for the genus Acer of the Aceraceae, a family of deciduous trees and shrubs of the Northern Hemisphere, found mainly in temperate regions and on tropical mountain slopes. Acer, the ...

Independence

(Encyclopedia)Independence. 1 City (2020 pop. 6,064), seat of Buchanan co., NE Iowa; founded 1847. Located on the Wapsipinicon River, the town's grist mill ...

Bremen

(Encyclopedia)Bremen brāˈmən [key], city, capital of the state of Bremen, NW Germany, on the Weser River...

modem

(Encyclopedia)modem [modulator/demodulator], an external device or internal electronic circuitry used to transmit and receive digital data over a communications line normally used for analog signals. A modem attach...

Speyer

(Encyclopedia)Speyer shpīˈər [key], city (1994 pop. 49,310), Rhineland-Palatinate, SW Germany, on the Rhine River. The city, sometimes called Spires in English, is a river port and industrial center; manufacture...