A Bourdon tube instrument is typically used to indicate which of the following?

A Bourdon tube instrument is primarily designed to measure pressure. The working principle of a Bourdon tube involves a flexible, curved tube that tends to straighten when internal pressure increases. This movement drives a pointer on a dial, indicating the pressure level.

In aviation and various engineering applications, measuring pressure is crucial for both safety and performance monitoring. The Bourdon tube can also be used in certain configurations to indirectly indicate temperature, particularly when combined with temperature-sensing methods, making it versatile in applications that require both pressure and temperature readings.

The other choices reflect instruments that typically utilize different mechanisms. Dynamic pressure and airspeed are usually measured by devices like pitot tubes and airspeed indicators that harness dynamic pressure principles. Altitude measurement relies on barometric altimeters that translate atmospheric pressure changes, while fuel flow and angle of attack assessments use flow meters and angle-of-attack indicators, respectively. Hence, a Bourdon tube is most accurately associated with pressure measurements.