Biography Category
metallic chemical element; symbol Ag [Lat. argentum]; at. no. 47; at. wt. 107.8682; m.p. 961.93°C; b.p. 2,212°C; sp. gr. 10.5 at 20°C; valence +1 o...
(py r zhül s zär´ zhäNs n´) (KEY) , 1824–1907, French astronomer. In 1857–58, in Peru, he worked on the determination of the magnetic equator...
(s j´ sm nd, s g´–) (KEY) , 1368–1437, Holy Roman emperor (1433–37), German king (1410–37), king of Hungary (1387–1437) and of Bohemia (14...
c.50,000 sq mi (130,000 sq km), barren region of central Australia, predominantly in the southeastern portion of the Northern Territory, extending S i...
sport of descending partly by parachute from an airplane or similar craft. Engaged in for both recreational and competitive purposes, sky diving invol...
(zhôz f´ m sh l´ môNgôlfy ´) (KEY) , 1740–1810, and Jacques Étienne Montgolfier (zhäk ty n´) (KEY) , 1745–99, French inventors, brothers...