| 1. | The interfacial tension against water at 20 �C is 8.97 mN / m.
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| 2. | Surfactants reduce the interfacial tension between oil and water by adsorbing at the liquid liquid interface.
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| 3. | It is desired that the surfactant will work at the lowest interfacial tension ( IFT ).
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| 4. | The force at equilibrium can then be used to determine the absolute surface or interfacial tension.
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| 5. | Below the CMC point, interfacial tension between oil and water phase is no longer effectively reduced.
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| 6. | As the interfacial tension increases, the net magnitude decreases due to an increase in capillary forces.
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| 7. | It refers to either using the fluids with low interfacial tension or working at very high angular velocities.
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| 8. | This method is widely used in many different applications such as measuring the interfacial tension of polymer blends and copolymers.
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| 9. | This empirical observation can be rationalised by considering the interfacial tension at the oil-surfactant and water-surfactant interfaces.
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| 10. | One disadvantage of this technique is that it can not bury the rod into the surface to measure interfacial tension between two liquids.
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