Units of Absolute and Gauge (gage) Pressures

A trailing qualifier of .abs or .gauge or .gage when added to any pressure unit will be accepted on input and in string conversion.

• The trailing qualifier will create a quantity with dimension of either absolute or gauge pressure.

• This trailing component can be added to both standard units such as pascal, bar, psi, atmosphere (bar.abs) and compound units (N/m2.abs, lbf/in2.gauge).

  Note:
  You cannot apply a single "a" or "g" as this means ampere or gram!

• The .gauge or .abs will be appended to compound units when quantities are formatted as gauge or absolute pressures.

A trailing "a" or "g" will be accepted on standard units (and their abbreviations) on input, and on string conversion.

• The trailing g or a will create an object with dimension of either gauge or absolute pressure, for example pascala, barg, psig, Paa, Pag

• It will be appended to standard units when quantities are formatted as gauge of absolute pressures

When gauge and absolute pressures are used in expressions they will always revert back to generic pressures. In particular there is no conversion factor applied between gauge and absolute pressures and so absolute is considered the same as generic pressures.

The two additional pressure dimensions are supported for absolute and gauge pressures (ABS_PRESSURE and GAUGE_PRESSURE)

• These can be set in format objects (both Programmable Macro Language (PML) and .Net) and used to format generic pressure quantities.

• They can be set for User Defined Attributes (UDAs) or Properties to define values of these will always be output as gauge or absolute quantities

• They will be able to have their own current units, distinct from generic pressure units. (similarly to DIST and BORE)