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Webster 1913 Edition


Isobar

I′so-bar

,
Noun.
[
Iso-
+ Gr. [GREEK] weight.]
(Phys. Geog.)
A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.
[Written also
isobare
.]

Definition 2024


Isobar

Isobar

See also: isobar

German

Noun

Isobar n (genitive Isobars, plural Isobare)

  1. (nuclear physics) isobar

Declension

isobar

isobar

See also: Isobar

English

A weather map showing isobars

Noun

isobar (plural isobars)

  1. (meteorology) A line drawn on a map or chart connecting places of equal or constant pressure.
  2. (nuclear physics) Either of two nuclides of different elements having the same mass number.
  3. (thermodynamics) A set of points or conditions at constant pressure.

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 ) Until recently it was standard procedure to draw isobars at 3-millibar intervals. However, the advent of constant pressure charts for upper-air analysis has brought about the use of 4-millibar intervals to simplify the conversion from surface isobars to 1,000-millibar contour lines.

Translations

See also


German

Pronunciation

  • Rhymes: -aːɐ̯

Adjective

isobar (not comparable)

  1. isobaric

Declension