Definition of isobar in English:
isobar
noun ˈʌɪsə(ʊ)bɑːˈaɪsəˌbɑr
1Meteorology
A line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
Example sentencesExamples
- Near the ground the winds are deflected across the contours, or isobars, towards the low pressure, due to friction.
- 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.
- The balance of forces is lost and the flow crosses the isobars (lines of equal air pressure) towards the low pressure.
- When isobars on a weather chart are close together, it will be a blustery day…
- 1.1Physics A curve or formula representing a physical system at constant pressure.
Example sentencesExamples
- 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.
2Chemistry
Each of two or more isotopes of different elements, with the same atomic weight.
Origin
Mid 19th century: from Greek isobaros 'of equal weight', from isos 'equal' + baros 'weight'.