Concept — The entropy of the universe does not decrease in real processes.
Present in chapters
11
Linked atoms
56 atoms linked.
11 Entropy
- Heat from hot to cold: proof
- Clausius, Boltzmann and the fate of the universe
- Freezer and the second law
- Hot shower: ΔS of the universe
- Two bodies in contact: ΔS of the universe
- Entropy in an irreversible cycle
- Entropic statement
- Worked example — the coffee cools down
- Worked example — free expansion is not reversible
- Worked example — maximum work from cooling coffee
- Worked example — why heat flows from hot to cold
- Sci-fi physics: entropy with opposite sign
- Sci-fi physics: without the second law
- Sci-fi physics: life and entropy
- Cooled iron: maximum work
- Freezer and life
- Gas in reversible adiabatic expansion
- The reversible cooling of coffee
- The arrow of time
- The arrow of time: why the past differs from the future
- The consequences of the second law
- Single-reservoir engine
- Carnot engine: ΔS of the universe
- Qualitative: the coffee cools down
- Qualitative: the falling glass
- Copper immersed in water: total ΔS
- Ranking ΔS of the surroundings
- Reversible and irreversible
- Melting ice: entropy of the universe
- Estimate: entropy of a cup of coffee
- Equilibrium temperature from entropy
- True or false on entropy (advanced)
- True or false on entropy (basic)
- ΔS of a mixture at different temperatures
- ΔS in two heat exchanges
- Is ΔS equal to zero admissible?
12 Cycles and heat engines
- Reversible adiabatic
- What makes a transformation reversible
- Worked example — reversible vs irreversible isothermal expansion
- General formula for the entropy of a gas
- Refrigerators and heat pumps
- The Carnot cycle and maximum efficiency
- The price of work
- Reversible isotherm
- Why Carnot is a beacon
- Problem — Carnot with three reservoirs
- Problem — Carnot compared with other cycles
- Problem — Entropy in a Carnot cycle
- Problem — Fridge with the door open
- Problem — Carnot efficiency as T_f tends to zero
- Problem — Room with an open fridge
- Problem — An engine with efficiency greater than 1
- Problem — An engine that is too efficient
- Problem — True or false on engines and refrigerators
- Problem — True or false on reversibility and cycles
- Sadi Carnot: a historical note