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Helmont, Jan Baptista van

(Encyclopedia)Helmont, Jan Baptista van yän bäptĭsˈtä vän hĕlˈmônt [key], 1577–1644, Flemish physician, chemist, and physicist. He attributed physiological changes to chemical causes, but his conclusions...

Baia Mare

(Encyclopedia)Baia Mare bīˈä mäˈrĕ [key], Hung. Nagybánya, city, NW Romania, in Crişana-Maramureş....

Willstätter, Richard

(Encyclopedia)Willstätter, Richard rĭkhˈärt vĭlˈshtĕtər [key], 1872–1942, German chemist. He was professor at the Kaiser Wilhelm Institute of Chemistry, Berlin (1912–16), and at the Univ. of Munich (191...

Woburn, city, United States

(Encyclopedia)Woburn wo͞oˈbərn [key], city (1990 pop. 35,943), Middlesex co., NE Mass.; settled 1640, inc. as a city 1888. Formerly a major center for tanneries, the city has electrical, pharmaceutical, chemical...

Bergerac

(Encyclopedia)Bergerac bĕrzhəräkˈ [key], town, Dordogne dept., SW France, in Périgord, on the Dordogne...

zinc sulfate

(Encyclopedia)zinc sulfate, chemical compound ZnSO4, a very water soluble, transparent, colorless, crystalline compound. It is commonly used as the heptahydrate, ZnSO4·7H2O, and is commonly called white vitriol; i...

Wallach, Otto

(Encyclopedia)Wallach, Otto, 1847–1931, German chemist, Ph.D. Univ. of Göttingen, 1869. Wallach was a professor at the Univ. of Bonn from 1870 to 1889 and at the Univ. of Göttingen from 1889 to 1915. In 1910 he...

Botany Bay

(Encyclopedia)Botany Bay, inlet, New South Wales, SE Australia, just S of Sydney. It was visited in 1770 by James Cook, who proclaimed British sovereignty over the east coast of Australia. The site of the landing i...

terbium

(Encyclopedia)terbium tûrˈbēəm [key] [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.92535; m.p. 1,356℃; b.p. 3,123℃; sp. gr. about 8.25; valence +3 or +4....

thulium

(Encyclopedia)thulium tho͞oˈlēəm [key] [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.93421; m.p. about 1,545℃; b.p. 1,947℃; sp. gr. 9.3; valenc...