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Glossary
AGA, AGA-8
Abbreviation for American Gas Association. This is an amalgamation of companies
producing and processing natural gas.
AGA-8 is a standardized algorithm for calculating the gas density.
Backspace
The backspace is a key on the PC keyboard which shifts the cursor back by one position
when pressed, and deletes the character present there. This corresponds to the "correction
key" function on a typewriter.
Calorific value
The calorific value (formerly referred to as gross calorific value or higher heating value) is a
measure of the thermal energy contained in a specified amount of material. The calorific
value of a fuel specifies the amount of heat generated upon burning of the fuel with
subsequent cooling of the combustion gases down to 25 °C with release of condensation.
Combustion gas
Combustion gas is a flammable gas that is mainly or frequently used as fuel. The most wellknown combustion gas nowadays is natural gas.
Compression factor
The compression factor (also referred to as compressibility factor, real gas factor or real
factor) describes the deviation of the behavior of a real gas from that of an ideal gas.
For ideal gases, the compression factor = 1, as derived from the ideal gas law. However,
simplifications have been included in the law which only correctly describe the response of
gases in limit cases - at low pressures, high temperatures, and volumes tending toward
infinity. With real gases, the compression factor therefore deviates from 1.
Density
See gas density.
CVControl operating software
Operating Manual, 11/2012, A5E01428676-03
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