標準號：ISO 9101-1987
中文標準名稱：表面活性劑 界面張力的測定 滴體積法
英文標準名稱：Surface active agents; Determination of interfacial tension; Drop volume method
標準類型：G72
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G72
國際標準分類號：71.100.40
適用范圍：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.