isobar
Definition from Wiktionary, a free dictionary
Contents |
[edit] English
[edit] Etymology
From Greek iso- + baros weight
[edit] Noun
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Singular |
Plural |
isobar (plural isobars)
- (meteorology) A line drawn on a map or chart connecting places of equal or constant pressure.
- (nuclear physics) Either of two nuclides of different elements having the same mass number.
- (thermodynamics) A set of points or conditions at constant pressure.
[edit] Usage notes
- Meteorology
- In meteorology, 'isobar' most often refers to a line drawn through all points of equal atmospheric pressure along 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 map of the air unaffected by surface heating or cooling. The pattern of isobars has always been a main feature of surface chart analysis. 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.
[edit] Translations
A line on a map connecting places of equal pressures
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