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isobar

isobar

1 7.9
A line on a weather map that connects places with the same air pressure
  • noun
  • /ˈaɪsəˌbɑr/
  • Specialized
translation icon : isóbara
  • Meteorologists use isobars to visualize areas of high and low pressure in the atmosphere.

It flows along the isobars instead of perpendicular across them.

Examples

  • And the closer the isobars are together, the stronger the wind will be.

  • Ice drift is, on average, parallel to the atmospheric-pressure isobars (black lines).

    Academic text (2011)
  • And on this particular day, the isobars look like this.

  • Instead, it moves along the isobars at right angles to the way pressure wants to push it.

    Academic text (1994)
  • The air doesn't move directly across the isobars from high to low pressure as you would expect.

    Academic text (1994)
  • Here are both the height lines and the pressure lines (isobars) on the same chart.

    Blog text (14)
  • It flows along the isobars instead of perpendicular across them.

  • Conversely, as wind blows out of a high-pressure cell, it also must cross isobars at right angles.

    Blog text (18)
  • For example, as wind moves toward a low-pressure center, as with a hurricane, its direction is altered so that as wind crosses each isobar surrounding the low, it must cross to the right of a right angle.

    Blog text (18)
  • On the weather map, the isobars connect locations with equal atmospheric pressure, helping to predict wind patterns.

Synonyms

isoline
vsisobar
  • Specialized
8.0

A line on a map that joins places with the same height or temperature

is specifically for equal atmospheric pressure at a single time
isometric line
vsisobar
  • Specialized
7.2

A line on a map connecting points that have the same value, like temperature or pressure

is limited to equal atmospheric pressure readings on weather maps
isogram
vsisobar
  • Specialized
9.9

A line on a map that connects points with the same value, like temperature

is focused only on equal atmospheric pressure rather than other variables
isopleth
vsisobar
  • Specialized
9.9

A line on a map that connects places with the same value, like temperature

is used only for equal atmospheric pressure rather than rainfall or temperature

Surface Forms

isobar singular
isobars plural

Morphology

isobar = bar (opaque) = iso + bar

Both components are technical/scientific and not obvious to an average B1 learner, so the meaning 'line of equal pressure' is not derivable.

Etymology

The word isobar comes from Greek parts iso- meaning 'equal' and baros meaning 'weight' or 'pressure', the same root as in barometer. So an isobar is a line on a weather map that connects places with the same air pressure.