1) Indicators of equal pressure 2) Lines from Willard Scott 3) Lines on a weather map 4) Lines on certain maps 5) Lines on weather maps 6) Map lines 7) Map pressure lines 8) Meteorological map lines 9) Pressure lines 10) Pressure lines on map 11) Some map lines 12) Some weather lines 13) Weather lines 
Lines drawn on a weather map connecting areas of equal pressure.
nuclides having the same mass number, but different atomic numbers
<chemistry, radiobiology> Nuclides having the same mass number but different atomic numbers. ... (16 Dec 1997) ... 
Isobars are lines on a map joining places of the same average barometric pressure.
The lines on a weather map that indicate areas of equal air pressure
Nuclides of the same atomic mass but different atomic number.
Nuclides of the same atomic mass but different atomic number.