How does the inclinometer function?

The inclinometer functions by operating on gravity. It is designed to measure the angle of the aircraft in relation to the horizontal plane. Essentially, the inclinometer uses a liquid-filled tube with a small ball or bubble inside that moves within the tube based on the aircraft's orientation. When the aircraft banks or tilts, gravity pulls the ball or bubble to one side, indicating the degree of tilt on the displayed scale.

This gravity-based mechanism is crucial for pilots to understand their aircraft’s attitude, especially during turns and maneuvers. The other options, such as pressure, electronic operation, or temperature, do not align with the fundamental principles of how an inclinometer functions in providing information about the aircraft's angular position relative to gravity.