it is the pressure of the atmosphere
Weather Maps: An isobar that is a closed circle indicates an area of high ("H") or low ("L") pressure center. Geographic Maps: An elevation on the map you are looking at. Sometimes numbers accompany the ring, to tell the elevation. Some times there are no numbers.
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The Isobar website offers many different services to customers. The Isobar company mostly specializes in communication services throughout the world.
Isobar.
An isobar is a line on a weather map connecting points of equal atmospheric pressure, indicating areas of high and low pressure.
Isobar.
An isobar diagram is commonly used in weather forecasting. It shows lines of equal air pressure.
Pressure. An isochore represents constant volume, while an isobar represents constant pressure.
An isobar
If you meant isobar - An isobar is a line on a map showing air pressure. the closer the isobars are packed together, the lower the pressure, and stronger the wind is.
An isobar shows locations that have the same atmospheric pressure.
Atmospheric pressure.