ChemistryAdvanced-Level Science ProjectsChemistryWhat's in a Color?Copper Magic Which Metal Corrodes the Fastest? Did you ever have a shiny new bike that over time got to look not so shiny and…
(Encyclopedia) occupational disease, illness incurred because of the conditions or environment of employment. Unlike with accidents, some time usually elapses between exposure to the cause and…
(Encyclopedia) Aswan or AssuanAssuanboth: äswänˈ, ăswănˈ [key], city (1986 pop. 190,579), capital of Aswan governorate, S Egypt, on the Nile River at the First Cataract. It is one of the driest…
(Encyclopedia) manganesemanganesemăngˈgənēs, mănˈ– [key] [Lat.,=magnet], metallic chemical element; symbol Mn; at. no. 25; at. wt. 54.93805; m.p. about 1,244℃; b.p. about 1,962℃; sp. gr. 7.2 to 7.45…
(Encyclopedia) SaarlandSaarlandzärˈlänt [key], state (1994 pop. 1,080,000), 991 sq mi (2,567 sq km), SW Germany; formerly called the Saar or the Saar Territory. Saarbrücken is the capital; other…
(Encyclopedia) radiumradiumrāˈdēəm [key] [Lat. radius=ray], radioactive metallic chemical element; symbol Ra; at. no. 88; mass number of most stable isotope 226; m.p. 700℃; b.p. 1,140℃; sp. gr. about…
(Encyclopedia) zirconiumzirconiumzərkōˈnēəm [key], metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852℃; b.p. 4,377℃; sp. gr. 6.5 at 20℃; valence +2, +3, or +4.…
