The Du Nouy ring method is a classic method of measuring surface tension. Measurement of the wet properties of the interface has little effect in this technique. The maximum tracción is mounted in the sleeve from the medium surface and a platinum sleeve is applied on the surface of the plate that is submerged in the liquid, ya que, the sleeve is extra from the liquid, the fuerza necessary to separate the liquid from surface. is calculated with precision, this force is associated with the surface tension of the liquid. Platinum rings must be precisely cleaned, free of stains and scratches, as these can influence the accuracy of the result.