Definitions for "Isobars"
Nuclides with the same mass number, such as 40K and 40Ca.
Isobars are nuclide having the same mass number but different atomic numbers. 54Cr and 54Fe, 112Cd and 112Sn are isobars.
Nuclides of the same atomic mass but different atomic number.
Lines drawn through positions having the same barometric pressure, when reduced to sea level.
Lines of constant pressure. On surface meteorological charts, these contours are used to delineate areas of low and high pressure.
The lines on a weather map that indicate areas of equal air pressure. Tightly packed isobars indicate unsettled weather.