What is a key role of the bourdon tube within a steam pressure gauge?

The bourdon tube is a crucial element in steam pressure gauges, specifically designed to measure pressure. It operates based on the principle that when the internal pressure of a gas or liquid acts on the curved bourdon tube, it causes the tube to straighten or change shape. This mechanical movement is then translated into a reading on the gauge, allowing for a precise indication of the pressure within the system.

The performance of the bourdon tube makes it highly suitable for various pressure measurement applications, including steam systems. Its ability to provide accurate readings at different pressure levels is essential for maintaining safe and efficient operations in piping systems.

The other options do not relate to the function of the bourdon tube in steam pressure gauges: measuring flow rate is a different mechanism involving flow meters, indicating temperature involves thermometric devices, and controlling pressure requires additional components such as pressure regulators or relief valves. Thus, the primary purpose of the bourdon tube is indeed to measure pressure.