If a loop of thread is dropped onto a soap film, as shown above, popping the soap film inside the thread will pull the thread into a circle. This is because the surface tension of the soap film outside the thread is reacting to the sudden loss of the balancing force exerted by surface tension inside the thread loop...Found at Fuck Yeah Fluid Dynamics.
الخميس، 13 ديسمبر 2012
Fun with surface tension
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