Final answer:
Lines of equal barometric pressure on a map are called isobars, and they are used to predict weather patterns.
Step-by-step explanation:
When displayed on a map, lines of equal barometric pressure are called isobars. Meteorologists use weather maps to describe and predict weather patterns and the behavior of storms.
Isobars are essential tools for determining the movement of weather systems and understanding regions of high and low pressure, which have significant effects on weather conditions. The pressure levels indicated by isobars are typically measured using a barometer, with one atmosphere (atm) being equivalent to 760 millimeter of mercury (mmHg).