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radiometer

(Encyclopedia)radiometer rāˌdēŏmˈətər [key], instrument for detection or measurement of electromagnetic radiation; the term is applied in particular to devices used to measure infrared radiation. One of the ...

rayon

(Encyclopedia)rayon, synthetic fibers made from cellulose or textiles woven from such fibers; more rayon is manufactured than any other synthetic fiber. The name was adopted (1924), in preference to “artificial s...

spectrum

(Encyclopedia)CE5 Dispersion of white light by a triangular prism spectrum, arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other propert...

Girondists

(Encyclopedia)Girondists zhērôNdăNˈ [key], political group of moderate republicans in the French Revolution, so called because the central members were deputies of the Gironde dept. Girondist leaders advocated ...

noise pollution

(Encyclopedia)noise pollution, human-created noise harmful to health or welfare. Transportation vehicles are the worst offenders, with aircraft, railroad stock, trucks, buses, automobiles, and motorcycles all produ...

Magdeburg

(Encyclopedia)Magdeburg mäkˈdəbo͝orkh [key], city (1994 pop. 270,546), capital of Saxony-Anhalt, central Germany, on the Elbe River. It is a large inland port, an industrial center, and a rail and road junction...

labor, in economics

(Encyclopedia)labor, term used both for the effort of performing a task and for the workers engaged in the activity. In ancient times much of the work was done by slaves (see slavery). In the feudal period agricult...

political science

(Encyclopedia)political science, the study of government and political processes, institutions, and behavior. Government and politics have been studied and commented on since the time of the ancient Greeks. However...

celibacy

(Encyclopedia)celibacy sĕlˈĭbəsē [key], voluntary refusal to enter the married state, with abstinence from sexual activity. It is one of the typically Christian forms of asceticism. In ancient Rome the vestal ...

Somme, Battles of the

(Encyclopedia)Somme, Battles of the, two engagements fought during World War I near the Somme River, N France. The first battle (July–Nov., 1916) was an Allied offensive. The British, commanded by Field Marshal S...