Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called "pressure gauges" or "vacuum gauges".
A "manometer" is an instrument that uses a column of liquid to measure pressure, although the term is currently often used to mean any pressure measuring instrument.
A vacuum gauge is used to measure the pressure in a vacuum—which is further divided into two subcategories: high and low vacuum . The applicable pressure ranges of many of the techniques used to measure vacuums have an overlap. Hence, by combining several different types of gauge, it is possible to measure system pressure continuously from 10 mbar down to 10 −11 mbar.
Everyday pressure measurements, such as for tire pressure, are usually made relative to ambient air pressure. In other cases measurements are made relative to a vacuum or to some other specific reference. When distinguishing between these zero references, the following terms are used:
The zero reference in use is usually implied by context, and these words are added only when clarification is needed. Tire pressure and blood pressure are gauge pressures by convention, while atmospheric pressures, deep vacuum pressures, and altimeter pressures must be absolute.
For most working fluids where a fluid exists in a closed system, gauge pressure measurement prevails. Pressure instruments connected to the system will indicate pressures relative to the current atmospheric pressure. The situation changes when extreme vacuum pressures are measured; absolute pressures are typically used instead.
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