Reference number
ISO 9101:1987
ISO 9101:1987
© ISO 2024
International Standard
ISO 9101:1987
Surface active agents — Determination of interfacial tension — Drop volume method
Edition 1
1987-12
1987-12
ISO 9101:1987
16696
Published
(Edition 1, 1987)
This publication was last reviewed and confirmed in 2019.
Therefore this version remains current.
Abstract
The volume of a drop of an aqueous phase formed at the end of a vertical capillary tube is measured when it detaches from the tube in contact with the organic phase. The interfacial tension between two liquid phases is obtained by balancing the weight of the drop with the interfacial tension force supporting it and applying a correction factor. Then the interfacial tension is calculated from the volume of the falling drop, the outer capillary radius, the density difference between the two liquid phases and the acceleration due to gravity.