In particle physics, strangeness S's a property of particles, expressed as a quantum number for describing decay of particles in strong and electro-magnetic reactions, which occur in a short period of time. The strangeness of a particle's defined as: » S = -(n_s - n_ represents the number of strange antiquarks and n_s represents the number of strange quarks . The derivation of the phrase "strange" or "strangeness" precedes the discovery of the quark, and was adopted after its discovery in orde… (More on Strangeness)