Barometers are essential scientific instruments used to measure air pressure, which is the force exerted by the atmosphere on objects at or near the Earth’s surface. Air pressure plays a critical role in weather forecasting, aviation, and meteorology in general. What is a Barometer? A barometer is an instrument used to measure the air pressure as it varies with distance, either above or below sea level. Wind is essentially air moving from high-pressure areas to low-pressure areas. How Do Meteorologists Use Barometers? Meteorologists use barometers as part of a broader set of tools to predict the weather. By regularly measuring air pressure, they can identify trends and patterns that indicate upcoming weather changes. Discover the primary function of a barometer: measuring atmospheric pressure. Understand how this vital weather instrument works and its importance in forecasting.