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Glossary
Glossary C
C-5
SI Units:
Pressure MPa
Ao m
2
b1 m
2
/m
2
/MPa
b2 m
2
/m
2
/MPa
2
c m
2
/m
2
/
o
C
Mass kg
Head Height cm
Elevation m
Length m
Sink Rate cm/min
Vacuum mtorr
Temperature
o
C
Trim g
Gravity cm/sec
2
Density g/cm
3
Humidity % RH
Sink Rate
Rate of descent of piston into cylinder.
Sleeve Mass Offset
Offset is used when a low mass sleeve is used and is loaded with additional masses.
Standard Deadweight Gauge (Dwg A)
Known gauge that other devices are compared against.
Temperature, Ambient
Temperature of the room.
Temperature, DWG
Temperature of the gas or oil measured at the deadweight gauge.
Temperature Factor
Correction for the effect of temperature on the area of the piston.
Temperature, Reference
Temperature selected by manufacturer for reporting piston/cylinder area.
Test Deadweight Gauge (Dwg B)
Unknown gauge in a cross-float calibration.
True Density
Actual density of the mass or piston.
True Mass
Mass based on actual material density as if weighted in vacuum; a.k.a. Newtonian Mass.
Uncertainty
The amount of possible error in the value.
Vacuum
The difference between absolute vacuum and the vacuum actually used.