What are the characteristics of a $"pure substance"$ ?

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Answer 1 · 2016-11-05T08:31:58

That it will have characterizing physical properties: $"melting point"$ ; $"boiling point"$ ; etc.

That it will have a definite chemical composition; that it will have definite, characterizing chemical properties.

Can you think of anything else?

What are the characteristics of a "pure substance""pure substance"?