FACTOID # 54: The Mall in Washington, D.C. is 1.4 times larger than Vatican City.
 
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Encyclopedia > Plateau's laws

Plateau's Rules describe the structure of soap films in foams. These rules were formulated in the 19th century by the Belgian physicist Joseph Plateau from his experimental observations. Plateaus phenakistiscope Joseph Antoine Ferdinand Plateau (October 14, 1801 - September 15, 1883) was a Belgian physicist. ...


Plateau's rules state:

  1. Soap films always meet in threes, and they do so at an angle of 120 degrees forming an edge called a Plateau Border.
  2. These Plateau Borders meet in fours at an angle of 109.47 degrees (the tetrahedral angle) to form a vertex.

Configurations other than those of Plateau's Rules are unstable and the foam will quickly tend to rearrange itself to conform to these rules.


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