|law (lô) Pronunciation Key
A statement that describes invariable relationships among phenomena under a specified set of conditions. Boyle's law, for instance, describes what will happen to the volume of an ideal gas if its pressure changes and its temperature remains the same. The conditions under which some physical laws hold are idealized (for example, there are no ideal gases in the real world), thus some physical laws apply universally but only approximately. See Note at hypothesis.
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