An isobar is a constant line of pressure on a map that connects areas of equal atmospheric pressure. Usually these maps contain multiple isobars denoting the different barometric pressures at different locations and altitudes. This map shows several isobars representing a low pressure system.
http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Hurr_Structure_Energetics/Closed_Isobars/Closed_Isobars_fig02.jpg
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