In which of the following thermodynamics process the temperature of a system decreases?
Correct answer: A. Adiabatic expansion
- A. Adiabatic expansion
- B. Isothermal expansion
- C. Adiabatic compression
- D. Isothermal compression
Explanation
The correct answer is Adiabatic expansion. In this process, the system does work on the surroundings without any heat exchange, leading to a decrease in its internal energy and temperature. In contrast, both isothermal processes (expansion and compression) maintain constant temperature due to heat exchange with the surroundings. Adiabatic compression increases the system's temperature because work is done on the system without heat exchange.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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