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motion

(Encyclopedia)motion, the change of position of one body with respect to another. The rate of change is the speed of the body. If the direction of motion is also given, then the velocity of the body is determined; ...

hymn

(Encyclopedia)hymn, song of praise, devotion, or thanksgiving, especially of a religious character (see also cantata). Early Christian hymnody consisted mainly of the Psalms and the great canticles Nunc dimittis, M...

War of 1812

(Encyclopedia)War of 1812, armed conflict between the United States and Great Britain, 1812–15. It followed a period of great stress between the two nations as a result of the treatment of neutral countries by bo...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...

mechanics

(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...

magic, in entertainment

(Encyclopedia)magic, in entertainment, the seeming manipulation and supernatural control of the natural world for the amusement and amazement of an audience. Entertainment magic can be divided into four main catego...

Saint Petersburg, city, Russia

(Encyclopedia)Saint Petersburg, formerly Leningrad, Rus. Sankt-Peterburg, city (1990 est. pop. 5,036,000), capital of the Leningrad region (although not administratively part of it) and the administrative center of...

chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

Dutch and Flemish literature

(Encyclopedia)Dutch and Flemish literature, literary works written in the standard language of the Low Countries since the Middle Ages. It is conventional to use the term Dutch when referring to the language spoken...

Enlightenment

(Encyclopedia)Enlightenment, term applied to the mainstream of thought of 18th-century Europe and America. Centered in Paris, the movement gained international character at cosmopolitan salons. Masonic lodges pla...