Exam-style question
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In a p-V diagram, what does a horizontal line indicate?.
- A.Constant pressure process
- B.Constant volume process
- C.Isothermal process
- D.Adiabatic process
Model answer
What a good answer should say
- Constant pressure process
Explanation
Why this works
A horizontal line on a p-V diagram indicates a constant pressure process. This is because the pressure remains unchanged while the volume changes, which is a characteristic of isobaric processes.
Recognizing this allows for better interpretation of thermodynamic changes.
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