Tuesday, February 07, 2006
Definition: In the interaction between particles, certain quantities remain the same before and after the event. Dynamical quantities such as mass-energy and momentum are conserved. Intrinsic properties of charge and baryon number are conserved in nuclear interactions. In addition, in strong and electromagnetic interactions between elementary particles, the intrinsic properties of strangeness, charm, topness and bottomness are also conserved but not in weak interactions.