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Pronunciation: i'so-bar


  1. One of two or more nuclides having the same total number of protons plus neutrons, but with different distribution, argon-40 with 18 protons and 22 neutrons, potassium-40 with 19 protons and 21 neutrons, calcium-40 with 20 protons and 20 neutrons. The product of a ß-disintegration is an isobar of its parent.
  2. The line on a map connecting points of equal barometric pressure.
  3. Any curve or equation relating quantities measured at the same pressure.

[iso- + G. baros, weight]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.