isobar

• (meteorology)an isogram connecting points having equal barometric pressure at a given time
• A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year
• The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science

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