Worked example

Inputs

Initial temperature: 300 K
Final temperature: 400 K
Initial absolute pressure: 100000 Pa
Final absolute pressure: 200000 Pa
Constant-pressure specific heat: 1005 J/(kg·K)
Specific gas constant: 287 J/(kg·K)
Mass flow: 1 kg/s

Expected results

Specific entropy change: 90.18724199 J/(kg·K)
Entropy transport change: 90.18724199 W/K

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

Enter every input in the labeled units; use measured or independently specified properties.
Check the stated model assumptions before calculating.
Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "t1": 300,
  "t2": 400,
  "p1": 100000,
  "p2": 200000,
  "cp": 1005,
  "gas": 287,
  "flow": 1
}

Accuracy and scope

Constant-property ideal gas; this state change is not automatically entropy generation, which requires a full process balance. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

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Ideal Gas Entropy Change