A scientific law expresses a regular relationship among observable quantities, together with a domain in which that relationship is applicable. It can supply quantitative predictions that connect an experiment with a mathematical model.
For example, Boyle's law describes the approximately constant product of pressure and volume for a fixed amount of gas at fixed temperature. The ideal gas law combines this relation with the dependence on temperature and amount of substance. Measurements at different conditions examine the limits of the approximation, while kinetic theory provides a microscopic account of why the relation emerges.
The usefulness of a scientific law rests on both its predictive success and its stated conditions. A compact equation such as becomes experimentally meaningful when its quantities, measurement procedure and range of applicability are specified.
A scientific law is a statement that describes a consistently observed phenomenon in nature under specific conditions. It is based on empirical evidence gathered through repeated experimentation and observation, and it often can be expressed mathematically. Scientific laws summarize the results of many observations and generally apply universally, providing a concise description of how elements of the natural world behave. Unlike scientific theories, which explain why phenomena occur and can evolve over time with new evidence, scientific laws do not attempt to provide explanations; they simply describe what happens.
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