Izobar

Izobar is a variant spelling of isobar used in meteorology and in certain languages. In meteorology, an izobar is a line on a weather map connecting points of equal atmospheric pressure, typically referenced to sea level. The units are hectopascals (hPa) or millibars (mb). Lines that are close together indicate a steep pressure gradient and are associated with strong winds; widely spaced lines indicate a weaker gradient and lighter winds. Closed izobars mark high-pressure systems (anticyclones) or low-pressure systems (cyclones). Isobars help meteorologists infer wind direction and speed, fronts, and the overall weather pattern.

In nuclear physics and chemistry, isobars are nuclides that share the same mass number A but have different atomic numbers Z. They are not the same element but have equal total numbers of protons and neutrons. Examples include Carbon-14 and Nitrogen-14 (A=14) or Calcium-40 and Argon-40 (A=40). The term isobar comes from Greek isos, equal, and baros, weight. Isobars are contrasted with isotopes (same Z, different N) and with isonas or isotonics in other contexts, which refer to different properties.

The spelling izobar is commonly used in Turkish and in other languages as the word for isobar; in English, isobar is the standard spelling. In multilingual scientific literature, izobar may appear as a direct transliteration of the local term.