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← ScienceWhich outcome occurs during the isothermal expansion phase of a Sterling engine?
A)Heat addition causes volume increase.✓
B)Pressure rise causes volume decrease.
C)Adiabatic expansion reduces pressure.
D)Internal energy stabilizes gas flow.
💡 Explanation
The engine uses heat addition, causing isothermal expansion because the gas does work on the piston to increase the volume at constant temperature. Therefore option A is correct; rather than pressure or internal-energy relationships driving the process.
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