Question:
In a free expansion of a gas
In a free expansion of a gas
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Work done ($w = -P_{ext}\Delta V$) is zero in free expansion because $P_{ext} = 0$.
Updated On: Apr 27, 2026
- heat absorbed is zero.
- work done is zero.
- initial pressure is zero.
- internal energy change is zero.
- external pressure is zero.
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The Correct Option is
Solution and Explanation
Step 1: Concept
Free expansion is the expansion of a gas into a vacuum.
Step 2: Meaning
A vacuum is defined by the absence of matter, meaning there is no resistance.
Step 3: Analysis
Since there is no opposing atmosphere, the external pressure ($P_{ext}$) is zero.
Step 4: Conclusion
Hence, correct answer is (E).
Final Answer: (E)
Free expansion is the expansion of a gas into a vacuum.
Step 2: Meaning
A vacuum is defined by the absence of matter, meaning there is no resistance.
Step 3: Analysis
Since there is no opposing atmosphere, the external pressure ($P_{ext}$) is zero.
Step 4: Conclusion
Hence, correct answer is (E).
Final Answer: (E)
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