Physicist’s principle

This crossword clue is for the definition: Physicist’s principle.
it’s A 21 letters crossword puzzle definition.
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Possible Answers: LAW.

Last seen on: Universal Crossword – Jan 9 2021

Random information on the term “LAW”:

A law is a universal principle that describes the fundamental nature of something, the universal properties and the relationships between things, or a description that purports to explain these principles and relationships.

For example, physical laws such as the law of gravity or scientific laws attempt to describe the fundamental nature of the universe itself. Laws of mathematics and logic describe the nature of rational thought and inference (Kant’s transcendental idealism, and differently G. Spencer-Brown’s work Laws of Form, was precisely a determination of the a priori laws governing human thought before any interaction whatsoever with experience).

Within most fields of study, and in science in particular, the elevation of some principle of that field to the status of law usually takes place after a very long time during which the principle is used and tested and verified; though in some fields of study such laws are simply postulated as a foundation and assumed. Mathematical laws are somewhere in between: they are often arbitrary and unproven in themselves, but they are sometimes judged by how useful they are in making predictions about the real world. However, they ultimately rely on arbitrary axioms.

LAW on Wikipedia