What does the Bourdon tube measure when used with a bulb and capillary tube?

The Bourdon tube is a device commonly used to measure pressure, and when paired with a bulb and capillary tube, it can be specifically configured to measure temperature. In this setup, the bulb is typically filled with a fluid that expands and contracts based on the temperature changes in the surrounding environment. As the temperature rises, the fluid in the bulb expands, and this change is transmitted through the capillary tube to the Bourdon tube, causing it to move and indicate the corresponding temperature on a dial or scale.

This method leverages the principle that fluids expand when heated and contract when cooled, allowing for accurate measurements of temperature in various applications. The design of the Bourdon tube mechanism translates this physical change into a readable output, making it an effective temperature measurement tool in engineering and industrial contexts.