What is an Isobar?

What is an Isobar?

• A. An equal line of pressure
• B. An equal line of temperature
• C. An equal line of humidity
• D. An equal line of wind speed

Answer: (A)

An isobar is a line on a weather map that connects points with the same atmospheric pressure. This visual shows how pressure changes across an area and helps you gauge the pressure gradient—the tighter the isobars are packed, the stronger the winds, since the air moves from high to low pressure more rapidly. Isobars are specifically about pressure, not temperature, humidity, or wind speed themselves, which are represented by other measures on weather maps.

An isobar is a line on a weather map that connects points with the same atmospheric pressure. This visual shows how pressure changes across an area and helps you gauge the pressure gradient—the tighter the isobars are packed, the stronger the winds, since the air moves from high to low pressure more rapidly. Isobars are specifically about pressure, not temperature, humidity, or wind speed themselves, which are represented by other measures on weather maps.