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प्रश्न
Why work done in vacuum is zero?
उत्तर
A free expansion means expansion against zero opposing force. Such expansion occurs in a vacuum. When the gas expands in a vacuum, there is no opposing force, that is, Pext = 0. The work done by a system during such expansion is W = – Pext ∆V = 0.
Thus, work done in a vacuum is zero.
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