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

Weapons 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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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3 e/ b. K- B3 |9 YNuclear 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:
9 v% G- X3 S; p$ L  u) ]3 b<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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6 n# l+ G- l% @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:
" Q) M/ Z' o, \/ N5 f<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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  U' P: t8 _+ s% nLerner, 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:
$ K5 K  f# O4 m  x, A1 U<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

7 r+ ?8 Z& e& c4 o' `/ K8 C" Lcritical mass
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7 A& K; `# e/ U2 z* ~! E1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
4 j4 K, C' h3 {8 [3 _2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
3 ^2 m2 v, v+ @! a<http://www.thefreedictionary.com/critical+mass>
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1 b* q/ V: h$ Y! z# S; l[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]