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lead, chemical element

(Encyclopedia)lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502℃; b.p. about 1,740℃; sp. gr. 11.35 at 20℃; valence +2 or +4. One of the oldest metals used by h...

Java

(Encyclopedia)Java jäˈvə [key], island (1990 pop. 107,525,520), c.51,000 sq mi (132,090 sq km), Indonesia, S of Borneo, from which it is separated by the Java Sea, and SE of Sumatra across Sunda Strait. Although...

silk

(Encyclopedia)silk, fine, horny, translucent, yellowish fiber produced by the silkworm in making its cocoon and covered with sericin, a protein. Many varieties of silk-spinning worms and insects are known, but the ...

Laos

(Encyclopedia)CE5 Laos läˈōs [key], officially Lao People's Democratic Republic, republic (2015 est. pop. 6,664,000), 91,428 sq mi (236,800 sq km), SE Asia. A landlocked nation, Laos is bordered by China on t...

Singapore

(Encyclopedia)CE5 Singapore sĭngˈgəpôr, sĭngˈə–, sĭngˌgəpôrˈ [key], officially Republic of Singapore, republic (2015 est. pop. 5,535,000), 299 sq mi (774 sq km). It consists of the island of Singap...

Andes

(Encyclopedia)Andes ănˈdēz [key], mountain system, more than 5,000 mi (8,000 km) long, W South America. The ranges run generally parallel to the Pacific coast and extend from Tierra del Fuego northward, across t...

Eswatini

(Encyclopedia)CE5 Eswatini or eSwatini, formerly Swaziland swäˈzēlănd [key],...

Thailand

(Encyclopedia)CE5 Thailand tīˈlănd, –lənd [key], Thai Prathet Thai [land of the free], officially Kingdom of Thailand, constitutional monarchy (2015 est. pop. 68,658,000), 198,455 sq mi (514,000 sq km), So...

sulfuric acid

(Encyclopedia)sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. Although sulfuric acid is now one of the most widely used c...

Inca

(Encyclopedia)Inca ĭngˈkə [key], pre-Columbian empire, W South America. The name Inca may specifically refer to the emperor, but is generally used to mean the empire or the people. When Francisco Pizarro lande...