Pressure measurement is the analysis of an applied force by a fluid (gas or liquid) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges. The pitot tube is used for the measurement of pressure of an incompressible fluid in motion. It measures local pressure at a specific point in the flow, as opposed to an average surface pressure.
A pressure gauge is used to measure the pressure of a gas or liquid inside a vessel and, often, to help ensure the pressure remains constant at an even level. Pressure gauges can range from everyday items, such as blood pressure gauges, to extremely accurate devices that monitor dangerous gasses in mining operations.
The pressure gauge is a kind of pressure measurement device, which can convert the measured oil pressure into pressure value and display it in the form of pointer rotation. The application requires an external power source or can be self-powered. A pressure gauge or manometer is a device used to measure the pressure of a gas or liquid inside a vessel and, often, to help ensure the vessel’s pressure remains constant.