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vacuum cleaner

(Encyclopedia)vacuum cleaner, mechanical device using a draft of air to remove dust, loose dirt, or other particulate matter from dry surfaces. It is especially useful on highly textured surfaces, such as carpets a...

Pulcheria

(Encyclopedia)Pulcheria pəlkērˈēə [key], 399–453, Roman empress of the East (414–53), daughter of Arcadius and Eudoxia. She became coruler with her brother, Theodosius II, and regent in 414. Theodosius rem...

Heaviside, Oliver

(Encyclopedia)Heaviside, Oliver hĕvˈēsīdˌ [key], 1850–1925, English physicist. He did valuable work in telephony and in the theory of electrical conduction in cables and other areas of electric theory. He su...

STP

(Encyclopedia)STP or standard temperature and pressure, standard conditions for measurement of the properties of matter. The standard temperature is the freezing point of pure water, 0℃ or 273.15K. The standard...

Young, Charles Augustus

(Encyclopedia)Young, Charles Augustus, 1834–1908, American astronomer, b. Hanover, N.H., grad. Dartmouth, 1853. He discovered the reversing layer of the solar atmosphere and proved the gaseous nature of the sun's...

weather

(Encyclopedia)weather, state of the atmosphere at a given time and place with regard to temperature, air pressure (see barometer), wind, humidity, cloudiness, and precipitation. The term weather is restricted to co...

León, city, Spain

(Encyclopedia)León, city (1990 pop. 137,758), capital of León prov., NW Spain, in Castile and León, at the foot of the Cantabrian Mts. and at the confluence of the Bernesga and Torio rivers. It is an agricultura...

Nassau, city, Bahamas

(Encyclopedia)Nassau năˈsô [key], city (1990 pop. 172,196), capital of the Bahamas. A port on New Providence island, it has a large and beautiful harbor and is the commercial and social center of the islands. It...

Le Fanu, Joseph Sheridan

(Encyclopedia)Le Fanu, Joseph Sheridan lĕˈ fənyo͞o [key], 1814–73, Irish author. He spent his early career as a journalist. In 1863, he began producing a series of stories noted for their reflections of Irish...

Manabe, Syukuro

(Encyclopedia)Manabe, Syukuro, 1931– , Japanese climatologist and meteorologist, D.Sc. University of Tokyo, 1958. Manabe has been instrumental in the development of...