pure substance


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pure substance

[′pyu̇r ′səb·stəns]
(chemistry)
A sample of matter, either an element or a compound, that consists of only one component with definite physical and chemical properties and a definite composition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
To prove it, the researchers carried out experiments with different pure substances and found that the first drop from the end of the condenser fell when the sample reached its boiling point.
* Model the particle structure of pure substances such as graphite, diamond, salt (sodium chloride) to understand that different solids have different particle structures and that these structure differences explain how hard or soft a solid is.
The company has combined its new Radical Protection Factor, a complex of botanical extracts and pure substances that neutralizes free radicals, with its Heliotan complex for Oil Free sprays SPF8 and SPF15 for comprehensive protection and a lasting tan.
Because of differences in the way molecules stick to the column, mixtures become separated into their individual components and can be analysed further as pure substances.
The authors consider various methods of experimental study of thermal and calorie properties of pure substances and binary mixtures in wide ranges of variation of independent variables, including the near-critical region.
The published literature reports only tests with very large amounts of pure substances.
"When you start dealing with mixtures, most of what we're saying about pure substances doesn't hold up," Shallenberger says.