If you are a registered university student, check your library’s "E-ShodhSindhu" (India) or "SpringerLink" (for international editions). Many universities have site licenses allowing you to download chapters as PDFs legally.
Unlike many Western textbooks (e.g., Reif or Pathria) that assume advanced calculus, Brijlal & Subramaniam cater to the average B.Sc. student. Each derivation—from Maxwell’s velocity distribution to the Sackur-Tetrode equation—is broken into manageable steps. If you are a registered university student, check