The pressure can be measured in an absolute or relative manner, depending on whether the atmospheric pressure of 1 bar at sea level is taken into account
We are all subjected to a pressure of 1 bar given by the air column of the atmosphere above and around us. Since this is the normal condition in which we all find ourselves, point 0 can be considered from which to measure the pressure and in this case we speak of relative pressure since it does not take into account the atmospheric pressure. The absolute pressure, on the other hand, takes it into account and therefore the starting condition is no longer 0 but 1 bar.
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