isobar

See also: Isobar and isòbar

English
Isobar Map (PSF)

Alternative forms

Etymology

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

Noun

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 notes
  • (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 terms

Translations

See also

Anagrams

Danish

Adjective

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

  1. (thermodynamics) isobaric

German

Pronunciation
  • IPA(key): /izoˈbaːɐ̯/
  • Audio(file)
  • Hyphenation: iso‧bar
  • Rhymes: -aːɐ̯

Adjective

isobar (strong nominative masculine singular isobarer, not comparable)

  1. isobaric

Declension
Positive forms of isobar (uncomparable)
number & gender singular plural
masculine feminine neuter
predicative er ist isobar sie ist isobar es ist isobar sie sind isobar
strong declension
(without article)		 nominative isobarer isobare isobares isobare
genitive isobaren isobarer isobaren isobarer
dative isobarem isobarer isobarem isobaren
accusative isobaren isobare isobares isobare
weak declension
(with definite article)		 nominative der isobare die isobare das isobare die isobaren
genitive des isobaren der isobaren des isobaren der isobaren
dative dem isobaren der isobaren dem isobaren den isobaren
accusative den isobaren die isobare das isobare die isobaren
mixed declension
(with indefinite article)		 nominative ein isobarer eine isobare ein isobares (keine) isobaren
genitive eines isobaren einer isobaren eines isobaren (keiner) isobaren
dative einem isobaren einer isobaren einem isobaren (keinen) isobaren
accusative einen isobaren eine isobare ein isobares (keine) isobaren

Further reading
  • “isobar” in Duden online
  • “isobar” in Digitales Wörterbuch der deutschen Sprache
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