## 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.

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"isobar." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 29 Apr. 2017 <http://www.encyclopedia.com>.

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"isobar." The Columbia Encyclopedia, 6th ed.. . Retrieved April 29, 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

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"isobar." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 29 Apr. 2017 <http://www.encyclopedia.com>.

"isobar." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (April 29, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/isobar-0

"isobar." The Oxford Pocket Dictionary of Current English. . Retrieved April 29, 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.

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"isobar." A Dictionary of Ecology. . Encyclopedia.com. 29 Apr. 2017 <http://www.encyclopedia.com>.

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"isobar." A Dictionary of Ecology. . Retrieved April 29, 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.

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"isobar." A Dictionary of Earth Sciences. . Encyclopedia.com. 29 Apr. 2017 <http://www.encyclopedia.com>.

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"isobar." A Dictionary of Earth Sciences. . Retrieved April 29, 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.

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"isobar." World Encyclopedia. . Encyclopedia.com. 29 Apr. 2017 <http://www.encyclopedia.com>.

"isobar." World Encyclopedia. . Encyclopedia.com. (April 29, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/isobar

"isobar." World Encyclopedia. . Retrieved April 29, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/isobar

## isobar

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