This compendium is provided to facilitate the computation of compressible flow through restrictions. In addition, graphical data are provided for characterizing nitrogen, helium, and argon gases. The information presented is density, entropy, enthalpy, viscosity, and specific heat as functions of pressure and temperature.

Information for Section 2, Compressible Flow through Restrictions, was extracted from The Analysis and Design of Pneumatic Systems, Andersen, Blaine W.; John Wiley and Sons, Inc., New York, 1967, pp. 17-21.

The information for Sections 3 and 4, Thermodynamic and Physical Properties of Nitrogen and Helium, was generated using a Garrett Fluid Systems Company computer program. The program utilizes equations and coefficients obtained from the National Bureau of Standards and was written by the late Dr. William G. Harrach.

The information for Section 5, Thermodynamic and Physical Properties of Argon, was generated using a computer program supplied by the National Bureau of Standards.