See also: Isobar


English Wikipedia has an article on:
Isobar Map (PSF)

Alternative formsEdit


From Ancient Greek ἴσος (ísos, equal) + βάρος (báros, weight), equivalent to iso- + bar-.


isobar (plural isobars)

  1. (meteorology) A line drawn on a map or chart connecting places of equal or constant pressure.
    Coordinate terms: isopleth, isohyet, isotherm
  2. (thermodynamics) A set of points or conditions at constant pressure.
  3. (nuclear physics) Either of two nuclides of different elements having the same mass number.

Usage notesEdit

  • (meteorology):
    In meteorology, the term isobar most often refers to a line drawn through connected points of equal atmospheric pressure on a given reference surface — such as a constant height surface (notably mean-sea-level on surface charts), the vertical plane of a synoptic cross section, or a layer of the air unaffected by surface heating or cooling. The pattern of isobars has always been a main feature of surface chart analysis. (See   Surface weather analysis on Wikipedia.Wikipedia ) It was standard procedure to draw isobars at 3-millibar intervals until the recent advent of constant pressure charts for upper-air analysis brought about the use of 4-millibar intervals to simplify the conversion from surface isobars to 1,000-millibar contour lines.


Derived termsEdit

See alsoEdit




isobar (neuter isobart, plural and definite singular attributive isobare)

  1. (thermodynamics) isobaric



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isobar (strong nominative masculine singular isobarer, not comparable)

  1. isobaric


Further readingEdit

  • isobar” in Duden online
  • isobar” in Digitales Wörterbuch der deutschen Sprache