Theory

Surface tension is a property of the surface of a liquid that allows it to resist an external force. We come across many applications of Surface Tension in our daily life, the use of detergent, soap, shampoo, creams, branded juice, soft drink, bear, pharmaceutical suspensions, printing, writing, printing etc are some common process, where Surface Tension has an important role to play. The formulator needs to use various Surfactants in order to develop a product which meet user’s expectations and are cost effective. They need to optimize the quantity of various surfactants in order minimize/ maximize the Surface tension.

There are different methods in use for the measurements of Surface Tension, which can be broadly classified as follows:

Static measurements

  • Du Nouy Ring Method
  • Wilhelmy Plate Method
  • Rod Method
  • Spinning Drop Method
  • Pendent Drop Method

 

Dynamic Method

  • Bubble Pressure Method
  • Drop Volume Method

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