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Standard
ISO 7392
First edition
Fine bubble technology —
2024-04
Evaluation method for determining
surface tension of ultrafine bubble
dispersions
Reference number
ISO 7392:2024(en) © ISO 2024
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ISO 7392:2024(en)
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© ISO 2024
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Published in Switzerland
© ISO 2024 – All rights reserved
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ISO 7392:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 General .2
4.2 Wilhelmy method .2
4.3 du Noüy method .2
4.4 Pendant drop method .2
5 Procedure . 2
5.1 Testing environment .2
5.2 Temperature measurement .2
5.3 Handling of the sample . .3
5.4 Cleaning of the measuring unit .3
5.4.1 Cleaning of the plate and ring .3
5.4.2 Cleaning of the measuring cup and syringe .3
5.5 Determination .3
5.6 Measurement of blank water .
...