What is the Difference Between Manometer and Piezometer?

The main difference between a manometer and a piezometer lies in the type of pressure they measure and the fluids they use. Here are the key differences between the two devices:

• Manometer: A manometer is used to measure gas pressure. It typically contains mercury and oil, and is designed to gauge gas pressure within a fluid. Manometers can measure both positive and negative pressures, and are versatile in their applications. They have a U-shaped glass tube and can be used for various pressure measurements.
• Piezometer: A piezometer is employed to measure liquid pressure. It contains mercury and water, and is used to gauge liquid height. Piezometers have a simple L-shaped glass tube and are directly mounted to a pipeline for the measurement of positive pressure of the liquid flowing through it. They have limited use compared to manometers.

In summary, manometers are used to measure gas pressure, while piezometers are used to measure liquid pressure. Manometers typically contain mercury and oil, while piezometers contain mercury and water. Manometers have a U-shaped glass tube, while piezometers have an L-shaped glass tube. Manometers are more versatile in their applications, while piezometers have limited use.

Comparative Table: Manometer vs Piezometer

Here is a table highlighting the differences between a manometer and a piezometer:

In summary, a manometer is a device used to measure gas pressure in a closed system, while a piezometer is used to measure underground water pressure or liquid pressure in general. Manometers typically have a U-shaped glass tube and contain mercury as a manometric liquid, while piezometers have an L-shaped glass tube and can contain water or a mixture of mercury and water.