Pascal (Pa): Pascal is the SI unit for measuring pressure. It is defined as one newton per square meter.
Manometer: A manometer is a device used to measure and indicate the pressure of fluids. It consists of a U-shaped tube filled with liquid that responds to changes in fluid pressure.
Gauge Pressure:Gauge pressure refers to the difference between absolute pressure and atmospheric pressure. It measures how much higher or lower a fluid's pressure is compared to atmospheric conditions.