Absoluttrycksmätning
Absoluttrycksmätning is a term in metrology that refers to the measurement of pressure relative to a perfect vacuum. Unlike gauge pressure, which measures pressure relative to atmospheric pressure, absolute pressure is the total pressure exerted by a system. This means that at zero absolute pressure, there is no matter and therefore no pressure.
In practice, achieving a perfect vacuum is difficult, but for most absolute pressure measurements, the residual
Several types of instruments are used for absolute pressure measurement. Barometers, for instance, are designed to