Definitions

1. noun

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

“The isobar on the map indicated a high-pressure system over the region.”

2. noun

An instrument used to measure atmospheric pressure.

“The meteorologist used an isobar to record the current atmospheric pressure.”

3. noun

A contour line on a map that marks a region of equal intensity in a vector field, such as a magnetic or gravitational field.

“The isobar on the map showed the areas with equal magnetic intensity.”