RMG ERZ2000-NG, Operating Manual

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7 Parameter of the gas
Manual ERZ 2000-NG · EN07 · 2019, May 13th
269
7.2.8 AJ Velocity of sound at measurement conditions
The velocity of sound is based on the present conditions (density or pressure and
temperature). Due to the identical structure of the preceding menus, no further repre-
sentations and explanations are provided here.
7.2.9 AK Velocity of sound at base conditions
The velocity of sound at base conditions is based on a pressure of 1,013 mbar and a
temperature of 0°C. Due to the identical structure of the preceding menus, no further
representations and explanations are provided here.
7.2.10 AM Viscosity
The viscosity describes the resistance of the gas to flow. Due to the identical struc-
ture of the preceding menus, no further representations and explanations are provid-
ed here.
7.2.11 AN Isentropic exponent
The isentropic exponent (formula symbol: κ ) is the exponent of the equation
݌ ڄ ܸ
఑
ൌ ܿ݋݊ݏݐǤ
for the isotropic status change (no change of entropy, i.e. no removal or addition of
heat) of an ideal gas. Due to the identical structure of the preceding menus, no fur-
ther representations and explanations are provided here.
7.2.12 AO Joule-Thomson coefficient
The Joule-Thomson effect describes the temperature change of gas with a change in
pressure. The magnitude and direction of the temperature change are described by
the Joule-Thomson coefficient
μ :
ߤ ൌ ൬
߲ܶ
߲݌
൰
௜௦௘௡௧௥௢௣௜௖