Ring and Thread

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 Code Number :   2A15.10

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Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

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Condition :   Excellent   
Principle :   Surface Tension
Area of Study :  Heat & Fluids  
Equipment :   Soap bubble solution, ring frame with thread network.

Procedure :   Dip the ring frame with thread network into the soap bubble solution and remove.  Hold up to the light and show that the thread network is limp because there is soap film both inside and outside of the thread loop.  Break the bubble inside the loop and the thread immediately pulls into a circle due to surface tension from the outside bubble.
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   References

L.M. Gratton and S. Oss, "Soap, Colors, Holes, and Much More", TPT, Vol. 43, # 6, p. 338, (Sept. 2005).

Ernest K. Chapin, "The Strange World of Surface Film", TPT, Vol. 4, # 6, Sept. 1966, p. 271.

 

Fi-13:  Freier and Anderson,  A Demonstration Handbook for Physics.

 



Mail Questions and Comments to:  Dale Stille