First Law of Thermodynamics in Closed System by PK NAG (Chapter 04)
First Law of Thermodynamics in Closed System by PK NAG (Chapter 04)
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What enrolled engineers say
Hit a few conceptual bottlenecks lately, and this chapter lined up with what I needed. The piston-cylinder boundary work example in Chapter 04, especially the sign convention table when heat/work flip during compression, stuck; I’ve already referenced it in a repo note for an infra PR. Not everything landed; wanted a quicker bridge to open systems or a brief hvacr tie-in, but for a beginner pass it wasn’t fluff. It nudged how I think about scaling load paths in prod arch, RPS included.
Module-to-module flow felt natural, so it's easy to jump in between meetings without losing context. Chapter 04’s boundary work bit stuck, especially the P–V diagram walkthrough to W = ∫PdV and the spring-loaded piston example. wasn't sold on the heat vs work sign table; I wished for one more numeric check tied to the plot. I've already used the framing to trim an overcooked arch note in our repo and tighten a PR comment touching prod infra.
Feels built by someone who’s had to push ideas all the way to prod, not just chalkboard. Chapter 04’s piston–cylinder with a linear spring example stuck; the step where boundary work flips sign after defining the system boundary cleared up a confusion I’ve seen bleed into infra docs and PRs. It’s beginner-friendly without hand-waving, though I wasn’t sold on skipping KE/PE so quickly. good enough that I’ve gone back twice to re-read the cyclic process section.
Your instructor
Saurabh Kumar Gupta
Content Manager
Mechanical Engineer
Is this course for you?
You should take this if
- You work in Aerospace or HVAC
- You're a Mechanical Engineering professional
- You prefer self-paced learning you can revisit
You should skip if
- You need a different specialisation outside Mechanical Engineering
- You need live interaction with an instructor
Course details
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Key topics covered
Course content
The course is readily available, allowing learners to start and complete it at their own pace.
- Introduction to the first law of thermodynamics for closed system27 min
- Numerical-124 min
- Numerical-225 min
- Heat Transfer For Various Process34 min
- Perpetual Motion Machine of First Kind3 min
- Free Expansion of Gases14 min
- Solved Example PK NAG Book34 min
- Problems with Hint PK Nag Chapter -426 min
- Pk Nag Problems Chapter-427 min
- Pk Nag Problems Chapter-442 min
- Numerical17 min
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What learners say about this course
Good
Feels built by someone who’s had to push ideas all the way to prod, not just chalkboard. Chapter 04’s piston–cylinder with a linear spring example stuck; the step where boundary work flips sign after defining the system boundary cleared up a confusion I’ve seen bleed into infra docs and PRs. It’s beginner-friendly without hand-waving, though I wasn’t sold on skipping KE/PE so quickly. good enough that I’ve gone back twice to re-read the cyclic process section.
Doesn't talk down like you've never touched a terminal—it moves briskly and gets to the equations. Chapter 04's spring‑loaded piston example (Example 4.7) on boundary work and the energy balance clicked, especially the sign convention callout. I wasn't sold on the skim over transient heat; wished there was one more worked problem, even a PR-style checklist, before trusting it in prod calcs. Still, it lingered longer than most beginner material; later hvacr load checks kept echoing.
Chapter 13’s Brayton cycle worked example with regenerator effectiveness—walking T2/T4 on the T‑s plot—made efficiency vs pressure ratio click fast. As a bootcamp grad, it maps cleanly to gas turbines in prod arch, but I wasn't sold on the skim of intercooling; wished for one more numeric pass.
Oct 2, 2026 
