Substance – matter is one of the two basic forms of existence of matter. It can also be called Energy.
It is a type of finite entity in space that has a rest mass. (See Relativity theory, special). The application of the concepts of simple and complex substances in chemistry has a place. Simple substances are those composed of identical atoms of the same chemical element; complex chemical compounds, on the other hand, are those composed of different atoms combined into molecules of chemical compounds.
Substance
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