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force

(Encyclopedia)force, commonly, a “push” or “pull,” more properly defined in physics as a quantity that changes the motion, size, or shape of a body. Force is a vector quantity, having both magnitude and dir...

mercury, chemical element

(Encyclopedia)mercury or quicksilver [from the Roman god Mercury], metallic chemical element; symbol Hg [Lat. hydrargyrum=liquid silver]; at. no. 80; at. wt. 200.59; m.p. −38.842℃; b.p. 356.58℃; sp. gr. 13.55...

Wittgenstein, Ludwig Josef Johann

(Encyclopedia)Wittgenstein, Ludwig Josef Johann loŏtˈvĭkh yōˈzĕf yōˈhän vĭtˈgənshtīn [key], 1889–1951, Austrian philosopher, b. Vienna. The second phase of Wittgenstein's philosophy commenced with ...

progressive education

(Encyclopedia)progressive education, movement in American education. Confined to a period between the late 19th and mid-20th cent., the term “progressive education” is generally used to refer only to those educ...

Richmond, cities, United States

(Encyclopedia)Richmond. 1 City (1990 pop. 87,425), Contra Costa co., W Calif., on San Pablo Bay, an inlet of San Francisco Bay; inc. 1905. It is a deepwater commercial port and an industrial center with oil refiner...

industrial management

(Encyclopedia)industrial management, term applied to highly organized modern methods of carrying on industrial, especially manufacturing, operations. Modern technological devices, particularly in the areas of com...

Nicholas II, czar of Russia

(Encyclopedia)Nicholas II, 1868–1918, last czar of Russia (1894–1917), son of Alexander III and Maria Feodorovna. Discontent at home grew, the army tired of war, the food situation deteriorated, the governme...

adult education

(Encyclopedia)adult education, extension of educational opportunities to those adults beyond the age of general public education who feel a need for further training of any sort, also known as continuing education....

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

particle accelerator

(Encyclopedia)CE5 Linear accelerator (LINAC) CE5 Cyclotron: As the charged particles move faster, they spiral out to the edge of the Ds. particle accelerator, apparatus used in nuclear physics to produce bea...