An isobaric line is a line connecting points on a map, chart or graph that share the same pressure level. It is an important concept in meteorology and weather forecasting. There are several synonyms for isobaric line that can be used interchangeably. These include isobar, pressure contour, pressure gradient line, pressure line, and contour line. These terms all refer to the same concept of a line connecting points of equal pressure on a map. Isobars are used by meteorologists to analyze and forecast weather patterns and are an essential tool in understanding atmospheric pressure and the movement of air masses.