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A chemical substance which maintains its molecular structure and amount of substance during the chemical and physical processes.
In petroleum industry the most frequent pure substances are Alkanes and popular mixtures are water (H2O), methane (CH4) and octane (C8H18).
a material made up of two or more different substances which are physically combined.[1] A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.[2][3]
Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.[4] Despite the fact that there are no chemical changes to its constituents, the physical properties of a mixture, such as its melting point, may differ from those of the components. Some mixtures can be separated into their components by using physical (mechanical or thermal) means
See Also
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Natural Science / Chemistry / Chemical Substance
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