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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.’
- ‘Near the ground the winds are deflected across the contours, or isobars, towards the low pressure, due to friction.’
- ‘When isobars on a weather chart are close together, it will be a blustery day…’
- ‘The balance of forces is lost and the flow crosses the isobars (lines of equal air pressure) towards the low pressure.’
- ‘The tight spacing of the isobars indicates strong northerly winds, averaging some 50 km/h over much of Victoria.’
- 1.1Physics A curve or formula representing a physical system at constant pressure.
- ‘No discontinuous change occurs in either the compression isotherm or the heating isobar.’
- ‘The heating isobar for the transformed monolayers remained virtually superimposable on the curve for films that had experienced no rapid compression.’
- ‘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.’
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.
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