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In particle physics, strangeness is a property of particles, expressed as a quantum number, for describing decay of particles in strong and electromagnetic interactions that occur in a short period of time. The strangeness of a particle is defined as: S = − ( n s − n s ¯ ) {\displaystyle S=-(n_{\text{s}}-n_{\bar {\text{s}}})} where n s represents the number of strange quarks ( s ) and n s represen... Wikipedia