A fixed mass of gas in a thermally insulated container is compressed. After compression, the temperature of the gas will have:
Correct answer: A. Risen
- A. Risen
- B. Decreased
- C. Remained constant
- D. Cannot be determined
Explanation
This is the correct answer. When a gas is compressed in a thermally insulated container (adiabatic process), work is done on the gas. This work increases the internal energy of the gas, which is directly related to the kinetic energy of its molecules. As the kinetic energy of the molecules increases, the temperature of the gas rises.
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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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