ISO 7392:2024
International Standard
Current Edition
·
Approved on
09 April 2024
Fine bubble technology — Evaluation method for determining surface tension of ultrafine bubble dispersions
ISO 7392:2024 Files
English
20 Pages
Current Edition
63.24 OMR
ISO 7392:2024 Scope
This document specifies evaluation methods for surface tension of ultrafine bubble (UFB) dispersion in water.
Three test methods, Wilhelmy, du Noüy and the pendant drop method, are adopted because of their advantages to detect small change in surface tension by UFB dispersion in water and the high accessibility to commercially available instruments.
This document can be used to measure the surface tension of liquid containing UFB dispersion in dilute surfactant water solution such as detergent or machining coolant as well as UFB dispersion in water.
NOTE Measurement data of liquid containing UFB dispersion in dilute surfactant water solution are summarized in Annex D.
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