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Chat · Thermodynamics — Lecture 7.pdf
Reading Lecture 7.pdf · 24 pages
Why does entropy increase in an irreversible process?
Because the process generates entropy inside the system itself — the heat term only accounts for what crosses the boundary, so the total ends up higher than the reversible case.
cited: p.14p.15
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Quiz · 8 questions · generated from your notes
Question 3 of 8

In an irreversible process, what happens to the total entropy of the system and its surroundings?

  • It stays constant
  • It decreases with temperature
  • It increases
  • It depends on the path taken
Why: entropy is a state function, so the path cannot change it — but an irreversible process generates some, so the total always goes up.
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Flashcards · Thermodynamics · 42 cards
FrontWhat does the second law say about an isolated system?
BackIts entropy never decreases — it increases until the system reaches equilibrium.
tap to reveal
Again<1m
Hard6m
Good4d
Easy9d
Scheduled again in 4 days · 41 cards left
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Recording · PHYS 253 — Thursday
REC00:35
  • 00:04So the second law is really a statement about direction.
  • 00:11Energy is conserved either way — that is the first law.
  • 00:19What the second law adds is which way the process runs.
  • 00:27Write this down: entropy of an isolated system never decreases.
  • 00:35That direction is the whole content of the second law.
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Thermodynamics — Lecture 7
Overview · generated from your document
5:096:00
ARight. You also need to know which direction it goes.
BAnd that is the part exams actually test.

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