An isochoric process is defined as one in which___________________?
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Answer: C. no mechanical work is done by the system
Explanation
An isochoric process occurs at a constant volume where system boundaries remain completely rigid and stationary. Mechanical work is calculated by integrating pressure with respect to changes in system volume over time. Since the volume change is zero, the resulting mechanical work done by the system is also zero. Isochoric processes are frequently referred to as constant volume thermodynamic heating or cooling processes. The first law applied to an isochoric process shows that heat transfer equals internal energy change. Rigid containers such as sealed metal tanks naturally facilitate isochoric thermodynamic property changes.
Combustion in a rigid closed vessel occurs under approximately constant volume conditions in specific engines. Heating a closed rigid pressure cooker creates an isochoric temperature and pressure rise inside. Engineers account for constant volume constraints when designing vessels to withstand high internal pressures. Option A describes free expansion, which involves irreversible expansion into a vacuum without external work. Option B incorrectly suggests that a tiny amount of mechanical work might still occur during the process. Option D is false because temperatures and pressures certainly change during typical isochoric heating cycles.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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