isobar

== English == === Alternative forms === isobare (dated) === Etymology === From Ancient Greek ἴσος (ísos, “equal”) + βάρος (báros, “weight”), equivalent to iso- + bar-. === Pronunciation === === Noun === isobar (plural isobars) (meteorology) A line drawn on a map or chart connecting places of equal or constant pressure. Coordinate terms: isopleth, isohyet, isotherm (thermodynamics) A set of points or conditions at constant pressure. (nuclear physics) Either of two nuclides of different elements having the same mass number. ==== Usage notes ==== (meteorology): In meteorology, the term isobar most often refers to a line drawn through connected points of equal atmospheric pressure on a given reference surface — such as a constant height surface (notably mean-sea-level on surface charts), the vertical plane of a synoptic cross section, or a layer of the air unaffected by surface heating or cooling. The pattern of isobars has always been a main feature of surface chart analysis. (See Surface weather analysis on Wikipedia.Wikipedia ) It was standard procedure to draw isobars at 3-millibar intervals until the recent advent of constant pressure charts for upper-air analysis brought about the use of 4-millibar intervals to simplify the conversion from surface isobars to 1,000-millibar contour lines. ==== Derived terms ==== isobaric ==== Translations ==== === See also === adiabat isochore isopleth isotherm isotone isotope === Anagrams === Borias, boiars == Danish == === Adjective === isobar (neuter isobart, plural and definite singular attributive isobare) (thermodynamics) isobaric == German == === Pronunciation === IPA(key): /izoˈbaːɐ̯/ Hyphenation: iso‧bar Rhymes: -aːɐ̯ === Adjective === isobar (strong nominative masculine singular isobarer, not comparable) isobaric ==== Declension ==== === Further reading === “isobar” in Duden online “isobar” in Digitales Wörterbuch der deutschen Sprache