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acid rain

(Encyclopedia)acid rain or acid deposition, form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). Produced when sulfur dioxide and various nitro...

Windsor, cities, Canada

(Encyclopedia)Windsor wĭnˈzər [key]. 1 Town (1991 pop. 3,625), central N.S., Canada, at the mouth of the Avon River on an arm of Minas Basin. It is the center of a gypsum and limestone-quarrying area. Manufactur...

wheel and axle

(Encyclopedia)CE5 Wheel and axle wheel and axle, simple machine consisting of a wheel mounted rigidly upon an axle or drum of smaller diameter, the wheel and the axle having the same axis. It is fundamentally a...

smog

(Encyclopedia)smog smŏg [key] [smoke+fog], dense, visible air pollution. Smog is commonly of two types. The gray smog of older industrial cities like London and New York derives from the massive combustion of coal...

Sebald, W. G.

(Encyclopedia)Sebald, W. G. (Winfried Georg Maximilian Sebald), 1944–2001, German novelist, grad. Freiburg Univ. (1965). Sebald's novels are dense, elegiac, and meditative. They mingle fiction with history and th...

Durban

(Encyclopedia)Durban dûrˈbən [key], city, now part and seat of eThekwini metropolitan municipality, KwaZulu-Natal prov., E South Africa, on Natal Bay, an arm of the Indian Ocean. Durban is an industrial center, ...

inclined plane

(Encyclopedia)CE5 Inclined plane inclined plane, simple machine, consisting of a sloping surface, whose purpose is to reduce the force that must be applied to raise a load. To raise a body vertically a force mu...

hydrometer

(Encyclopedia)hydrometer hīdrŏmˈətər [key], device used to determine directly the specific gravity of a liquid. It usually consists of a thin glass tube closed at both ends, with one end enlarged into a bulb t...

Great Salt Lake

(Encyclopedia)Great Salt Lake, shallow body of saltwater, NW Utah, between the Wasatch Range on the east and the Great Salt Lake Desert on the west; largest salt lake in North America. Fed by the Weber, Jordan, and...

amplifier

(Encyclopedia)amplifier, device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has a larger amplitude. The input signal may be a current, a voltage, a...