A sample of an ideal gas may: expand adiabatically or expand isothermally. The net flow of heat into the gas from the exterior is:
Correct answer: E. Zero in I and positive for II
- A. Positive in each case
- B. Negative for I and positive for II
- C. Positive for I and negative for II
- D. Zero in each case
- E. Zero in I and positive for II
Explanation
An adiabatic process is a thermodynamic process that involves the transfer of energy without transfer of heat or mass to the surrounding that it is zero in the case of I. While isothermal processes are those in which the temperature change is zero, that only implies the temperature change is zero, not the heat energy change.
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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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