Determination of surface tension from the measurement of internal pressure of mini soap bubbles

F. Behroozi, P. S. Behroozi

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We review the elementary theory that gives the internal pressure of a soap bubble in terms of its radius and surface tension. The theory is generalized to relate the pressure difference across any element of a soap film to its local curvature. This result is used to introduce the concept of the mean curvature of a surface element and is applied to a double soap bubble to obtain the relation between the three radii that characterize its geometry. We also describe a simple setup, suitable for the undergraduate laboratory, to produce mini bubbles and to obtain the surface tension of the soap solution by measuring the radius and internal pressure of the bubbles.

Original languageEnglish (US)
Pages (from-to)1089-1093
Number of pages5
JournalAmerican Journal of Physics
Volume79
Issue number11
DOIs
StatePublished - Oct 18 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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