Isobar

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An isobar is a line of equal or constant pressure on a graph, plot, or map; an isopleth of pressure. In meteorology, the pressures shown are reduced to sea level, not the surface pressures at the map locations. These can be used to predict future weather patterns.

Also, in nuclear physics, two nuclides with the same mass number are called isobars. For example, Boron-12 and Carbon-12 are isobars.

Isobar has also occasionally been used as a synonym for a heat pipe.

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