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Pressure excess

  1. Apr 26, 2007 #1
    in the surface tension about the pressure excess notion i have problem: why for a full dropplet of water the formular is p=2T/r whereas for a bubble p=4T/r. Why does it be multiplied by 2.
     
  2. jcsd
  3. Apr 26, 2007 #2
    In a filled drop there is only a surface. In a bubble there is also the internal surface. When you increase the radius, in the first cas,e only a surface increases. In the second, two surfaces increase.
     
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