Which instrument is used to measure air pressure?

The aneroid barometer is specifically designed to measure air pressure without the need for liquid, making it highly effective in various conditions, including those experienced in aviation. This instrument uses a flexible metal chamber that expands and contracts with changes in air pressure. As pressure increases, the chamber compresses; as it decreases, the chamber expands. These movements are transferred into a pointer that indicates the pressure on a dial.

Understanding air pressure is crucial in meteorology and aviation because it affects weather patterns and aircraft performance. For example, a drop in atmospheric pressure may indicate incoming storms, while higher pressure often correlates with clearer skies. The aneroid barometer, therefore, provides valuable real-time measurements that are essential for making predictions and decisions in air travel.

The thermometer, hygrometer, and psychrometer, while useful for measuring temperature and moisture levels, do not provide data on air pressure. Therefore, these instruments are not suitable for this specific function.