Absolute Pressure
Definition
Absolute Pressure is the pressure of a system measured relative to a perfect vacuum (absolute zero pressure).
It is the total pressure exerted by a system, including atmospheric pressure. Unlike gauge pressure, absolute pressure is never negative.
A Quantity in QUDT having a QuantityKind of AbsolutePressure would typically assert the value of qudt:isDeltaQuantity to be false,
indicating that the value is not a difference between two pressures but an absolute measurement from vacuum.^^http://qudt.org/schema/qudt/LatexString