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A Buoyancy-Driven Perpetual Motion Machine

Tadashi Tokieda
The American Mathematical Monthly
Vol. 120, No. 6 (June–July 2013), pp. 564-566
DOI: 10.4169/amer.math.monthly.120.06.564
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Page Count: 3
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A Buoyancy-Driven Perpetual Motion Machine
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Abstract A perpetual motion machine driven by buoyancy is presented. We see that it does not quite work, and we also discuss how it would move in reality. Debunking the trick behind most such machines is a nice exercise in exact and non-exact differentials.

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