Daily Almanac for
Nov 8, 2009
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conserva'tion of lin'ear momen'tum



Physics.
the principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

conservation of lepton numberconservation of mass
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