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formula, in mathematics and physics

(Encyclopedia)formula, in mathematics and physics, equation expressing a definite fixed relationship between certain quantities. The quantities are usually expressed by letters, and their relationship is indicated ...

ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...

Ishim, river, Russia and Kazakhstan

(Encyclopedia)Ishim, river, c.1,130 mi (1,819 km) long, W Siberian Russia and Kazakhstan. It rises N of Qaraghandy in Kazakhstan (where it is known as the Esil), flows W past Atbasar, N past Petropavl, and then joi...

Cardamoms, mountains, Thailand and Cambodia

(Encyclopedia)Cardamoms kärˈdəməmz [key], Thai Banthat, Khmer Kravanh, mountain group extending c.100 mi (160 km) along the Thai-Cambodian border, E of Chanthaburi, SE Thailand. The mountains receive monsoon ra...

Oise, river, Belgium and France

(Encyclopedia)Oise, river, 186 mi (299 km) long, rising in the Ardennes Mts., S Belgium, and flowing through N France generally SW past Compiègne to join the Seine River near Pontoise. Navigable for most of its le...

Eden, rivers, England and Scotland

(Encyclopedia)Eden, name of several rivers in England and Scotland. The principal one rises in Cumbria, N England, and flows 65 mi (105 km) NW past Carlisle, into Solway Firth. The Vale of Eden is a rich farming re...

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