What substance can be called pure?

Authors

  • Vladimir P. Zlomanov Lomonosov Moscow State University, Leninskie Gory, 1, Moscow 119991, Russian Federation
  • Mikhail F. Churbanov G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

DOI:

https://doi.org/10.17308/kcmf.2026.28/13806

Keywords:

Substance, Purity, Homogeneity, Silicon, Isotopic composition

Abstract

Objectives: The concept of a substance and the features of its composition, purity, and homogeneity are considered. Substances that consist of particles of the same type and have constant properties under the same conditions are usually called pure. Absolutely pure substances do not exist because contamination with impurities is energetically favorable and occurs spontaneously. There is no unified international classification of substances by purity. Therefore, the purity of substances is assessed by comparing the measured value of a property with that required for using the substance in a functional device.

 Conclusions: Using statistical methods, substances for which the deviation of the measured property value from the weighted average does not exceed the confidence limits can be considered homogeneous

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Author Biographies

  • Vladimir P. Zlomanov, Lomonosov Moscow State University, Leninskie Gory, 1, Moscow 119991, Russian Federation

    Dr. Sci. (Chem.), Professor, Lomonosov Moscow State University (Moscow, Russian Federation)

  • Mikhail F. Churbanov, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Academician of the Russian Academy of Sciences, Dr. Sci. (Chem.), Professor, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Science (Nizhny Novgorod, Russian Federation)

References

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Published

2026-06-25

Issue

Vol. 28 No. 2 (2026)

Section

Short communication

License

Copyright (c) 2026 Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

What substance can be called pure?. (2026). Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 28(2), 325-328. https://doi.org/10.17308/kcmf.2026.28/13806