Laws of Nature are a stated regularity in the relations or order of phenomena in the world that holds, under a stipulated set of conditions, either universally or in a stated proportion of instances. In either case, a law may be valid even though it obtains only under special circumstances or as a convenient approximation.
All scientific laws appear to give similar results.
The class of universal statements that can be candidates for the status of laws, however, is determined at any time in history by the theories of science then current. Several positive attributes are commonly required of a natural law. Finally, it is normally expected that a law will be explainable by more embracing laws or by some theory. Thus, a regularity for which there are general theoretical grounds for expecting it will be more readily called a natural law than an empirical regularity that cannot be subsumed under more general laws or theories. Universal laws are of several types.