This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.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.