isobar

A line on a weather map connecting points of equal atmospheric pressure.

Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system when p has any constant value; a line of equal pressures.

In physical geography, a line connecting places on the surface of the globe at which the barometric pressure is the same.

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; an isopiestic line.

A line drawn on a map or chart connecting places of equal or constant pressure.

Either of two nuclides of different elements having the same mass number.

A set of points or conditions at constant pressure.

(meteorology)an isogram connecting points having equal barometric pressure at a given time