The Strangeness reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Strangeness

In particle physics, Strangeness is the number of s-quarks in a particle. Strangeness is conserved during the strong interaction and the electromagnetic interactions, but during the weak interactions associated with particle decay it is changed by 1 in either direction; isotopic spin is conserved only during the strong interactions.

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