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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

0 Q4 `* g6 R! J( T4 fWeapons 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:
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: G" c) n2 H3 f7 c* r5 ?9 M) l0 i9 uNuclear 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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$ O6 F) z1 F% s) \5 BClark, 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:
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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:
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# s. m& n& M0 Ccritical mass
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
/ G3 @+ B. O# Q2 P& t6 |. x; `" E2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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' d. B$ K; G! Y! s1 y[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]