physical law
Noun
Meaning
A scientific generalization based upon empirical observation that is part of physics, standing in contrast to chemical law, biological law, sociological law, etc.
A universal statement about the operation of nature, based on empirical observations of physical behavior, tested using the scientific method.
Source: en.wiktionary.orgExamples
Sometimes nature guards her secrets with the unbreakable grip of physical law. Sometimes the true nature of reality beckons from just beyond the horizon.
The mathematical facts worthy of being studied are those which, by their analogy with other facts, are capable of leading us to the knowledge of a physical law.
I find purer philosophy in a Poem than in a Conclusion of Geometry, a chemical analysis, or a physical law.
No one hangs himself by the rope of a physical law. The equations fall tirelessly into themselves.
A physical law must possess mathematical beauty.