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cerium

(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...

platinum

(Encyclopedia)platinum plătˈənəm [key], metallic chemical element; symbol Pt; at. no. 78; at. wt. 195.084; m.p. 1,772℃; b.p. 3,827±100℃; sp. gr. 21.45 at 20℃; valence +2 or +4. Pure platinum is a malleab...

Schliemann, Heinrich

(Encyclopedia)Schliemann, Heinrich hīnˈrĭkh shlēˈmän [key], 1822–90, German archaeologist, discoverer of the ruins of Troy. He accumulated a fortune in the indigo trade and as a military contractor and reti...

Planck, Max

(Encyclopedia)Planck, Max mäks plängk [key], 1858–1947, German physicist. Seeking to explain the experimental spectrum (distribution of electromagnetic energy according to wavelength) of blackbody radiation, he...

intelligence

(Encyclopedia)intelligence, in psychology, the general mental ability involved in calculating, reasoning, perceiving relationships and analogies, learning quickly, storing and retrieving information, using language...

Würzburg

(Encyclopedia)Würzburg vürtsˈbo͝ork [key], city (1994 pop. 128,875), capital of Lower Franconia, Bavaria, S central Germany, on the Main River. It is an industrial city, the center of a wine-producing region, a...

Kant, Immanuel

(Encyclopedia)Kant, Immanuel ĭmänˈo͞oĕl känt [key], 1724–1804, German metaphysician, one of the greatest figures in philosophy, b. Königsberg (now Kaliningrad, Russia). The impact of Kant's work has be...

Stein, Karl, Freiherr vom und zum

(Encyclopedia)Stein, Karl, Freiherr vom und zum kärl frīˈhĕr fəm o͝ont tso͝om shtīn [key], 1757–1831, Prussian statesman and reformer. Rising through the Prussian bureaucracy, he became minister of commer...

Schubert, Franz Peter

(Encyclopedia)Schubert, Franz Peter fränts pāˈtər sho͞oˈbərt [key], 1797–1828, Austrian composer, one of the most gifted musicians of the 19th cent. His symphonic works represent the best legacy of the cla...

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...