Definition of isobar in English:

isobar

Line breaks: iso¦bar
Pronunciation: /ˈʌɪsə(ʊ)bɑː
 
/

noun

  • 1 Meteorology A line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
    More example sentences
    • 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…
  • 1.1 Physics A curve or formula representing a physical system at constant pressure.
    More example sentences
    • 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.
  • 2 Chemistry Each of two or more isotopes of different elements, with the same atomic weight.

Derivatives

isobaric

Pronunciation: /-ˈbarɪk/
adjective
More example sentences
  • A phase transition produced by isothermally increasing surface pressure can often be reversed during isobaric heating.
  • This diagram is the same as the one above except that the major pressure and wind zones have been replaced by a typical isobaric weather map.
  • For all simulations, isothermal and isobaric conditions were assumed.

Origin

mid 19th century: from Greek isobaros 'of equal weight', from isos 'equal' + baros 'weight'.

More definitions of isobar

Definition of isobar in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day tortie
Pronunciation: ˈtôrtē
noun
a tortoiseshell cat