What does pressure actually mean in the physical sense?
The state variable pressure (p) is defined as a force (Fn) which is uniformly applied to a certain surface (A). This force can be applied by a liquid, by gases or by solid bodies.
What does pressure actually mean in the physical sense?
The state variable pressure (p) is defined as a force (Fn) which is uniformly applied to a certain surface (A). This force can be applied by a liquid, by gases or by solid bodies.
Example pressure compensator
Pressure corresponds to the weight of calibrated weights according to the adjacent formula. p(e) = overpressure, m = mass of the weights, g = acceleration of gravity and A(0) = (effective) cross-section.
The pressure units
The pressure unit Pascal (Pa) is derived from the unit of the (weight) force Newton (N), i.e. N je m². One pascal (Pa) corresponds to the pressure acting evenly on a surface when a force of 1 N is exerted vertically on an area of 1 m².
Pascal (Pa)
Measurement in cleanrooms or in flow velicity measurements with Pitot tube.
hPa (= mbar)
Gas flow pressure, gas static pressure
bar, KPa, MPa
Standard units in industrial pressure measuring technology.
mmHg
(= millimeters of mercury) Standard for medical technology (blood pressure) instead of the previous mmH2O.
micron
Smallest unit (750 micron = 1hPa) in the pressure range, e.g. when evacuating refrigeration systems.