What is the main purpose of a barometer in meteorology?

The main purpose of a barometer in meteorology is to measure atmospheric pressure. Atmospheric pressure is the weight of the air above a given point, and it plays a crucial role in weather prediction and understanding atmospheric conditions. Changes in atmospheric pressure can indicate different weather patterns; for example, falling pressure often suggests that a storm is approaching, while rising pressure typically indicates fair weather. By monitoring these changes, meteorologists can forecast weather more accurately and provide important information for navigation, aviation, and public safety.

Other options represent different meteorological tools or measurements. For instance, thermometers are used to measure temperature, hygrometers measure humidity, and anemometers are designed to gauge wind speed. Each of these tools serves a distinct purpose and is essential for gathering comprehensive weather data, but the barometer’s specific role focuses solely on atmospheric pressure.