么正性（英語：Unitarity）是物理學名詞[1]，指的是某個物質於時刻在全空間找到粒子的總機率等於[2]。若微觀粒子不能產生和湮沒，那麼某時刻波函數滿足歸一化條件，則在任何時刻，波函數都將保持歸一化（機率守恆）。它敘述的是微觀過程物質不滅的原理。
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