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Surface tension with the ring method (Du Nouy method)

Surface tension with the ring method (Du Nouy method)

Item no.: P2140500

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Principle

The force is measured on a ring shortly before a liquid film tears using a torsion meter. The surface tension is calculated from the diameter of the ring and the tear-off force.

Benefits

  • High sensitivity measurement possible thanks to ring method
  • Analogue set-up that can also be used as a demo experiment in the lecture hall
  • Torsion dynamometer used can measure very small forces and is therefore suitable to measure other electrostatic and magnetic interactions between bodies
  • Interdisciplinary use also in applied sciences or physical chemistry

Tasks

  1. Determine the surface tension of olive oil as a function of temperature.
  2. Determine the surface tension of water/methanol mixtures as functions of the mixture ratio.

What you can learn about

  • Surface energy
  • Interface
  • Surface tension
  • Adhesion
  • Critical point
  • Eötvös equation

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