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debt, public

(Encyclopedia)debt, public, indebtedness of a central government expressed in money terms, often referred to as national debt. The debt is computed differently by nearly every nation. Some authorities exclude all g...

chromatography

(Encyclopedia)chromatography krōˌmətŏgˈrəfē [key], resolution of a chemical mixture into its component compounds by passing it through a system that retards each compound to a varying degree; a system capabl...

Monaco

(Encyclopedia)CE5 Monaco mŏnˈəkō, mōnäˈkō, Fr. mônäkōˈ [key], officially Principality of Monaco, independent principality (2015 est. pop. 38,000), c.370 acres (150 hectares), on the Mediterranean Sea...

Freemasonry

(Encyclopedia)Freemasonry, teachings and practices of the secret fraternal order officially known as the Free and Accepted Masons, or Ancient Free and Accepted Masons. Because of its identification with 19th-cent...

infrared astronomy

(Encyclopedia)infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from trees and building...

petroleum

(Encyclopedia)petroleum, oily, flammable liquid that occurs naturally in deposits, usually beneath the surface of the earth; it is also called crude oil. It consists principally of a mixture of hydrocarbons, with t...

Philadelphia, city, United States

(Encyclopedia)Philadelphia, city (2020 pop. 1,603,797), coextensive with Philadelphia co., SE Pa., on the Delaware River c.100 mi (160 km) upstream at the influx of t...

Beethoven, Ludwig van

(Encyclopedia)Beethoven, Ludwig van lŭdˈwĭg văn bāˈtōvən, Ger. lo͝otˈvĭkh fän bātˈhōfən [key], 1770–1827, German composer. He is universally recognized as one of the greatest composers of the West...

navigation

(Encyclopedia)navigation, science and technology of finding the position and directing the course of vessels and aircraft. The next great revolution in navigation occurred in the 20th cent., when radio signals ...

telephone

(Encyclopedia)CE5 Hand telephone telephone, device for communicating sound, especially speech, usually by means of wires in an electric circuit. The telephones now in general use evolved from the device invente...