Isentropic Process

What is Isentropic Process?

A reversible, adiabatic process along which entropy stays exactly constant — the idealised, frictionless limit that no real machine ever quite reaches. Turbine and compressor efficiencies are defined by comparing actual performance against this ideal isentropic baseline.

The five clues

Engineerdle #44 described Isentropic Process with five clues, revealed one at a time from hardest to most direct. Each clue points at a different property of the concept.

1. 01An idealisation that's both adiabatic and something else at once.
2. 02That second condition is reversibility.
3. 03No real process ever quite achieves it — friction and turbulence see to that.
4. 04Turbine and compressor efficiency are both measured against this ideal baseline.
5. 05A reversible adiabatic process, along which entropy stays exactly constant.

More Thermodynamics concepts

• Triple PointPuzzle #52
• EntropyPuzzle #39
• Adiabatic ProcessPuzzle #34
• Latent HeatPuzzle #14
• Specific Heat CapacityPuzzle #9
• First Law of ThermodynamicsPuzzle #4