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Drinking Bird H-c3c
This toy bird keeps bobbing its head in water because the evaporative cooling and internal pressure differences force the liquid inside above its center of mass, whereupon it tips, momentarily restoring equilibrium. Fishbane Chapter:   19.5 HRW 9th:   19.07 Reese Chapter:   15.3 SJ 3rd Chapter:   16.6 PIRA DCS classification:   4C31.30

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University