It seems you are looking for a specific academic resource: the classic text Molecular Theory of Gases and Liquids by Joseph O. Hirschfelder, Charles F. Curtiss, and R. Byron Bird, and specifically a reference to “pdf41” or something “better” than that version.
Key Features
You can read and borrow the 1964 Edition on Internet Archive. 🔬 Overview of the Text It seems you are looking for a specific
Transport Properties: If you need to calculate the viscosity, thermal conductivity, or diffusion coefficients of a gas mixture, this book contains the fundamental derivations that modern empirical formulas are based on.
The Appendices are Gold: Don't skip the back of the book. The tables for the functions used in calculating transport coefficients are still used to verify modern simulation results. Byron Bird, and specifically a reference to “pdf41”
In essence, the search for a "better" PDF is a cry for digital clarity: a version that respects the complexity of the original typesetting.
Introduction
: This "Corrected Printing" fixed numerous typographical errors and updated several mathematical derivations found in the original 1954 release. Advanced Kinetic Theory : Includes in-depth sections on the Chapman-Enskog
Molecular Properties and Interactions