The notation "'bar ( g ) "', though deprecated by various bodies, represents gauge pressure, i . e ., pressure in bars above ambient or atmospheric pressure.
22.
Gauge pressure is often given in units with'g'appended, e . g .'kPag','barg'or'psig', and units for measurements of absolute pressure are sometimes given a suffix of'a', to avoid confusion, for example'kPaa','psia '.
23.
The combination of vacuum consolidation, which is equivalent to approximately ten to fourteen psi external pressure, and steam at about the same gauge pressure, will give better results and faster heat-up than the oven would.
24.
"' Unsaturated "'conditions occur above the water table where the pressure head is negative ( absolute pressure can never be negative, but gauge pressure can ) and the water that incompletely fills the pores of the aquifer material is under suction.
25.
For both liquids in elastic pipes / tubes ( which is what blood in blood vessels is ) and gasses, pressure is measured in either of two ways, depending on application : " absolute pressure ", and " gauge pressure ".
26.
Your car's tire pressure is also an example of gauge pressure & mdash; a flat tire at " 0 psi " contains air at the ambient atmospheric pressure, not a vacuum .-- talk ) 17 : 01, 1 September 2009 ( UTC)
27.
Millions of these miniature machines, known as microelectromechanical systems, or MEMS, may surround us one day, embedded in the concrete foundations of roads and bridges to monitor their conditions, aloft to check for biological warfare agents in the atmosphere, or attached to automobile tires to gauge pressure.
28.
A vented gauge pressure transmitter for example allows the outside air pressure to be exposed to the negative side of the pressure sensing diaphragm, via a vented cable or a hole on the side of the device, so that it always measures the pressure referred to ambient barometric pressure.
29.
For this reason, the pressure relative to atmospheric pressure is called gauge pressure and measurements given in units like pounds per square inch ( abbreviated lbf / in 2 or psi ) are often shown as " psig " ( the " g " standing for gauge ) or " psia " ( " a " for absolute ).
