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Isobar vs Isotach - What's the difference?

isobar | isotach |

As nouns the difference between isobar and isotach

is that isobar is a line drawn on a map or chart connecting places of equal or constant pressure while isotach is a line of equal or constant wind speed on a graph or chart, such as a weather map.

isobar

English

(wikipedia isobar)

Noun

(en noun)
  • (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.

    • 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)) 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.

    See also

    * adiabat * isobaric * isochore * isopleth * isotherm * isotone * isotope ----

    isotach

    English

    Noun

    (en noun)
  • A line of equal or constant wind speed on a graph or chart, such as a weather map.