A pressure gauge is an instrument used to measure a condition of a fluid which is either liquid or gas and is specified by the force that it would exert when at rest. It has a unit area of Newton per square centimeter or pounds per square inch. The difference between two pressures (absolute pressure minus atmospheric pressure) is known as gauge pressure. It is the additional pressure in a system used for most practical measurements. This pressure measuring device is commonly used as blood pressu ...
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