Why external pressure is used in the formula of work done?
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Answer:
cuz
Explanation:
Pressure is needed for it
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Explanation:
In free expansion a gas expands without an opposing external pressure. Even if the original internal gas pressure was 2 or 10 atm, the work is still zero because no opposing force is present. ... The only resistance is therefore the external pressure and thus this is what you must work against
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