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Atomic or molecular species with the same nominal mass but different exact masses.
Note 1: In the case of atoms, this is equivalent to different nuclides of equal mass number.
Note 2: Isobaric ions are isobars that all carry an electric charge.
Note 3: This term is used in meteorology to denote lines connecting points of equal atmospheric pressure.
Related Term(s):

Revised from

IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins.

From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.

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