幺正性（英语：Unitarity）是物理学名词[1]，指的是某个物质于时刻在全空间找到粒子的总概率等于[2]。若微观粒子不能产生和湮没，那么某时刻波函数满足归一化条件，则在任何时刻，波函数都将保持归一化（概率守恒）。它叙述的是微观过程物质不灭的原理。
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