The Bourdon tube can be used with a bulb and capillary tube to measure:

The Bourdon tube is a mechanical device commonly used to measure pressure. When used in conjunction with a bulb and capillary tube, it can effectively measure temperature by utilizing the principle of expansion of a fluid within the bulb. As the temperature of the environment increases, the fluid inside the bulb expands, causing the pressure to increase in the capillary tube connected to the Bourdon tube. This pressure change is then translated into a temperature reading on the Bourdon tube gauge.

This method is particularly useful in applications requiring precise temperature measurements in refrigeration and HVAC systems, where maintaining specific temperatures is critical for efficiency and safety. The use of a sealed fluid in the bulb allows for accurate transmission of temperature changes, making this combination a reliable choice for temperature measurement.