In an adiabatic compression of a gas
Correct answer: A. the temperature of the gas rises because work is done on it with no heat escaping
- A. the temperature of the gas rises because work is done on it with no heat escaping
- B. the temperature falls
- C. the temperature stays constant
- D. heat flows into the gas from outside
Explanation
With no heat exchange, the work done on the gas must all go into internal energy, so the temperature rises, which is why a bicycle pump warms up when used quickly. Rapid compression is effectively adiabatic because there is no time for heat to escape. The reverse, adiabatic expansion, cools a gas, and that is how clouds form as air 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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