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Nuclear weapons:( p+ F$ N: s K: C, S5 r: z
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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' {8 l& O$ @( w! t! PWeapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale: 3 Y" I+ T5 ?' E2 `: w q; e: m
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Nuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale:
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Clark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale: / I: T( A2 K' P
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Lerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale: Q8 i. y9 ^- L1 e
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critical mass5 T7 N' z. j E" m) j2 |/ E
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) F E; U% }( m& f3 ~1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level." t) j9 Y6 {! q$ X% D. u1 k
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
2 @' i* c5 e& t5 C. J* Q% a1 o<http://www.thefreedictionary.com/critical+mass>7 J8 ?) ?$ m& m! x: G* ^
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