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Glossary
Glossary C
C-3
Head Height
Vertical distance between reference planes. A positive value indicates the Device Under
Test is higher than the standard.
Head Correction
Pressure correction for head height.
Humidity
Current ambient relative humidity. Used to compute air density if not entered as a
constant.
+INF, -INF
Infinity. The number is bigger than can be represented. Computing altitude at zero
pressure will give this value.
L1
Distance from the top of the mass loading surface to the bottom of the piston.
Latitude
Distance from the equator in degrees and minutes of latitude. Used to compute local
gravity if not entered as a constant.
Mass, Apparent
May be Apparent Mass versus Brass Standards or Apparent Mass versus Steel Standards.
An expression of the effective mass of a given object with an assumed density, typically
that of the standard used to measure the mass value. In a practical sense, Apparent Mass
versus Brass Standards describes what an object appears to weigh when compared to a
brass standard in the presence of a buoyant atmosphere. See also Buoyancy; Reference
Density; True Mass; and Density of Air.
Mass, Nominal
Pressure converted to mass before corrections are applied.
Mass, Tare
Mass of the least number of components required to generate a pressure, in many cases
the piston only.
Mass, Total
Mass used to generate a pressure. Included both platter masses and trim masses.
Mass, Trim
Small masses used to generate an exact pressure.
Mass, True
A quantitative expression of the amount of matter in an object. See also Mass Apparent
Mass Set File
Contains all information for a mass set.
Medium
The fluid or gas used to generate pressure.
+NAN, -NAN
Not A Number. The value cannot be computed (i.e., division by zero).
Piston/Cylinder File
Contains all information for a single piston/cylinder set.
Pressure, Ambient
Local atmospheric pressure.
Pressure, Corrected
Pressure after corrections have been applied.