Which instrument is commonly used to measure airspeed in aircraft?

The airspeed indicator is the instrument specifically designed to measure the aircraft's speed relative to the surrounding air. It provides crucial information to pilots, as airspeed is a key element in determining aircraft performance during all phases of flight, including takeoff, landing, and in-flight maneuvers.

The airspeed indicator operates based on the difference between pitot pressure and static pressure, converting this information into a readable format that pilots use to ensure they maintain safe operating speeds. This instrument is critical for avoiding stalls and ensuring efficient fuel usage, contributing to overall safety and effectiveness of flight operations.

In contrast, the altimeter measures altitude above sea level based on atmospheric pressure, while the vertical speed indicator provides information about the rate of ascent or descent, and the situational awareness display typically integrates various navigational and operational data rather than focusing solely on airspeed. Each of these instruments serves a distinct function in aviation, making the airspeed indicator essential for assessing flight conditions.