A bourdon tube is a mechanical device used to measure pressure. It consists of a curved, hollow tube that straightens when pressure is applied inside it. This movement is then translated into a reading on a dial, allowing users to monitor pressure levels in various applications, such as in industrial equipment or automotive systems. The design of the bourdon tube is simple yet effective, making it a popular choice for pressure gauges. It can measure both gas and liquid pressures, providing accurate readings in many settings. Its reliability and ease of use contribute to its widespread adoption in fields like engineering and manufacturing.