Definition of isobar in English:


Pronunciation /ˈīsəˌbär/ /ˈaɪsəˌbɑr/

See synonyms for isobar

Translate isobar into Spanish


  • 1Meteorology
    A line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.

    ‘Secret Meteorological Office charts show the alarming swirl of isobars converging in black lines over the Channel.’
    • ‘The tight spacing of the isobars indicates strong northerly winds, averaging some 50 km/h over much of Victoria.’
    • ‘When isobars on a weather chart are close together, it will be a blustery day…’
    • ‘Near the ground the winds are deflected across the contours, or isobars, towards the low pressure, due to friction.’
    • ‘The balance of forces is lost and the flow crosses the isobars (lines of equal air pressure) towards the low pressure.’
    1. 1.1Physics A curve or formula representing a physical system at constant pressure.
      ‘The heating isobar for the transformed monolayers remained virtually superimposable on the curve for films that had experienced no rapid compression.’
      • ‘No discontinuous change occurs in either the compression isotherm or the heating isobar.’
      • ‘For the heated film, the substantial reversion of the transformed film to the original behavior occurred without any discontinuous change in area or in the slope of the heating isobar.’
  • 2Chemistry
    Each of two or more isotopes of different elements, with the same atomic weight.


Mid 19th century from Greek isobaros ‘of equal weight’, from isos ‘equal’ + baros ‘weight’.