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Encyclopédie
(Encyclopedia)Encyclopédie äNsēklôpādēˈ [key], the work of the French Encyclopedists, or philosophes. The full title was Encyclopédie; ou, Dictionnaire raisonné des sciences, des arts, et des métiers. Thi...ultraviolet radiation
(Encyclopedia)ultraviolet radiation, invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 1015 to 1017 hert...Liechtenstein
(Encyclopedia)Liechtenstein lĭkhˈtənshtīnˌ [key], officially Principality of Liechtenstein, principality (2015 est. pop. 37,000), 62 sq mi (160 sq km), W central Europe. It is situated in the Alps between Aust...limit
(Encyclopedia)limit, in mathematics, value approached by a sequence or a function as the index or independent variable approaches some value, possibly infinity. For example, the terms of the sequence 1⁄2, 1⁄4, ...gasoline
(Encyclopedia)gasoline or petrol, light, volatile mixture of hydrocarbons for use in the internal-combustion engine and as an organic solvent, obtained primarily by fractional distillation and “cracking” of pet...pension
(Encyclopedia)pension, periodic payments to one who has retired from work because of age or disability. Pensions, originally thought of as charity, are now viewed as an essential part of the social responsibility o...inflation
(Encyclopedia)inflation, in economics, persistent and relatively large increase in the general price level of goods and services. Its opposite is deflation, a process of generally declining prices. The U.S. Bureau ...obesity
(Encyclopedia)obesity, condition resulting from excessive storage of fat in the body. Obesity is now usually defined using a formula known as the body mass index (BMI), in which weight (in kilograms) is divided by ...refraction
(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...lens, in optics
(Encyclopedia)CE5 Lenses lens, device for forming an image of an object by the refraction of light. In its simplest form it is a disk of transparent substance, commonly glass, with its two surfaces curved or wi...Browse by Subject
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