Which device is used to measure pressure?

The Bourdon tube is specifically designed for measuring pressure and is one of the most widely used pressure measurement devices. It operates on the principle of the elastic deformation of a curled tube when subjected to pressure. As the pressure inside the tube increases, the tube tends to uncoil or straighten, causing a pointer attached to it to move on a dial, providing a direct reading of the pressure.

While the bellows, manometer, and barometer are also pressure measuring devices, they operate on different principles. Bellows are typically used in applications requiring the measurement of low-pressure changes or the transmission of pressure signals, converting pressure changes into mechanical movement. A manometer is used for measuring the pressure of gases or liquids, typically in small-range applications, and works by balancing the liquid column against the pressure being measured. A barometer measures atmospheric pressure and is essential for weather forecasting and determining altitude.

Understanding the specific applications and operational principles of these devices is crucial for selecting the right instrument for particular measurement scenarios. This contextual knowledge helps ensure accurate and appropriate pressure measurements in various environments.