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Bookmark or Share- Matter | Definition of Matter by Merriam-Webster2 a: the substance of which a physical object is composed. b: material substance that occupies space, has mass, and is composed predominantly of atoms consisting of protons, neutrons, and electrons, that constitutes the observable universe, and that is interconvertible with energy. c: a material substance of a particular kind or for a particular purpose vegetable matter
- Matter - WikipediaComparison with mass. Matter should not be confused with mass, as the two are not the same in modern physics. Matter is a general term describing any 'physical substance'.By contrast, mass is not a substance but rather a quantitative property of matter and other substances or systems; various types of mass are defined within physics – including but not limited to rest mass, inertial mass ...
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