完全决定论(principle of complete determinism)是经典物理里一个很重要的特点,是经典物理与量子物理明显的分界线。用数学表述,经典物理方程内绝对不会有普朗克常数的出现。根据对应原理与埃伦费斯特定理,当系统变得越来越大或质量增加时,即作用量超大于普朗克常数,经典物理的特征倾向就会出现,但也有例外,超流体就是其中之一。因此,论及日常物体,我们通常可以忽略量子力学,经典地描述就足够了。可是,在物理学里,现在最热门的研究科目之一是经典量子对应问题:量子物理的定律,在经典的规模尺寸极限,怎样转变为经典物理?
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