Differentiate between U-tube manometers and piezometer?

1. U-tube manometer:
- A U-tube manometer is a device used to measure pressure differences in a fluid system.
- It consists of a U-shaped tube filled with a liquid, typically mercury or water.
- The difference in height of the liquid in the two arms of the U-tube indicates the pressure difference between the two points in the system.
- U-tube manometers are commonly used in HVAC systems, hydraulic systems, and other fluid systems.

2. Piezometer:
- A piezometer is a device used to measure the pressure at a single point in a fluid system.
- It consists of a tube inserted into the fluid at the point where the pressure is to be measured.
- The height of the fluid in the tube indicates the pressure at that point.
- Piezometers are commonly used in geotechnical engineering to measure pore water pressure in soil, as well as in hydrology and groundwater monitoring.

In summary, U-tube manometers are used to measure pressure differences between two points in a system, while piezometers are used to measure pressure at a single point in a system.