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Chemical composition : ウィキペディア英語版
Chemical composition
The chemical composition (or simply composition) is a concept in chemistry that has different (but similar) meanings if referred to a single pure substance or a mixture.
== Composition of a substance ==

The chemical composition of a pure substance it corresponds to the relative amounts of the elements that constitute the substance itself. It can be express by the empirical formula.
For example the formula for water is H2O: this means that each molecule it is constituted by 2 atoms of hydrogen (H) and 1 atom on oxygen (O).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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