There is no 6th edition with 71 chapters. Current edition is Revised Edition 2014 or later.
The book is divided into three major parts, totalling 25–28 chapters depending on edition. There is no 6th edition with 71 chapters
Despite newer textbooks (Reif, Pathria, Huang, Blundell, Schroeder), Brijlal & Subrahmanyam’s book stays relevant for Indian university curricula because: The Revised Edition 2014 has 752 pages
Q1: Is “671” a specific edition of Brijlal’s book?
No. No known edition has 671 pages. The Revised Edition 2014 has 752 pages. The 2018 reprint has 728 pages. “671” is a red herring. Despite newer textbooks (Reif
Q2: Can I find a free PDF of this book legally?
Not the full book, because it is copyrighted. Free PDFs online are pirated copies. However, S. Chand sometimes provides sample chapters (first 3–4) on their website for evaluation.
Q3: Is the book good for CSIR-NET Physics?
Yes, for the Thermodynamics & Statistical Physics sections of Part A and Part B. But for Part C (advanced stat mech), supplement with Pathria or Huang.
Q4: What does “install” mean in the search term?
It is likely a corrupt filename from a site that distributes a “PDF installer” (malware). Never click on “install” for a textbook PDF.