An additive flavor symmetry quantum number: a strange quark has , its antiquark has , and up and down quarks have . The strong interaction conserves net strangeness. Together with baryon number, it determines flavor hypercharge .
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Strangeness is a property of particles in the realm of particle physics, specifically relating to the presence of strange quarks within particles. It is a quantum number that describes how much a particle deviates from being a "normal" baryon or meson regarding the number of strange quarks it contains.