Skip to main content
Select Source:

isobar

isobar (ī´səbär´) or isobaric line (ī´səbăr´Ĭk), line drawn on a weather map through points of equal atmospheric pressure. Isobars are used to define cyclones (low-pressure regions) and anticyclones (high-pressure regions). Weather maps are designed to depict the horizontal pressure distribution across an area of land, but atmospheric pressure also varies vertically, i.e., with altitude. To eliminate any consideration of the vertical variations of pressure, the barometer readings at all stations are reduced to their corresponding sea-level pressures before the isobars are drawn.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/isobar

"isobar." The Columbia Encyclopedia, 6th ed.. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/isobar

isobar

i·so·bar / ˈīsəˌbär/ • n. 1. Meteorol. a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period. ∎  Physics a curve or formula representing a physical system at constant pressure. 2. Physics each of two or more isotopes of different elements, with the same atomic weight. DERIVATIVES: i·so·bar·ic / ˌīsəˈbarik; -ˈbär-/ adj.

isobars

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/isobar-0

"isobar." The Oxford Pocket Dictionary of Current English. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/isobar-0

isobar

isobar A line on a weather map connecting points that are at the same atmospheric pressure. On surface charts the values are ‘reduced’ to sea level. Such isolines are drawn at a given interval in millibars. Contours of isobaric surfaces may be drawn to represent surfaces in the upper atmosphere composed of points at the same pressure.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." A Dictionary of Ecology. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." A Dictionary of Ecology. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/isobar-0

"isobar." A Dictionary of Ecology. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/isobar-0

isobar

isobar Line on a weather map connecting points at the same atmospheric pressure. On surface charts the values are ‘reduced’ to sea level. Such isolines are drawn at a given interval in millibars. Contours of isobaric surfaces may be drawn to represent surfaces in the upper atmosphere composed of points at the same pressure.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." A Dictionary of Earth Sciences. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/isobar

"isobar." A Dictionary of Earth Sciences. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/isobar

isobar

isobar Line on a weather map connecting points of equal pressure, either at the Earth's surface or at a constant height above it. The patterns of isobars depict the variation in atmospheric pressure, showing areas of high and low pressure on the map.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." World Encyclopedia. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." World Encyclopedia. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/isobar

"isobar." World Encyclopedia. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/isobar

isobar

isobarAkbar • handlebar • sandbar • kasbah •baba • rebar • heelbar • Finbar •millibar • coolibah • minibar •Zanzibar • sidebar • crossbar •crowbar, towbar •rollbar • Nicobar • isobar • durbar

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"isobar." Oxford Dictionary of Rhymes. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"isobar." Oxford Dictionary of Rhymes. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/isobar

"isobar." Oxford Dictionary of Rhymes. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/isobar