Interfacial tension

[@bangjaggi-ov1tn]

i really love the way you teach. u can find many great researcher, but great teacher is really rare

[@syahrialfitrachman7843]

Thank you sir!

[@hamzaalyaseri6047]

Thank you professor, very helpful information

[@bkairosh8164]

Great content sir. Thanks for sharing your knowledge.

[@Toby-i5h]

Thank you! I love your video! And I have question regarding interfacial tension. If I measure the interfacial tension between water and oil using pendandrop method, would the results be different if I do it by creating water drop in water compared to inverted oil drop in water? I guess the results are the same? Can Young Laplace equation explain it mathmatically?

[@BoffyBlunt]

Thank you for your comment. The results should be the same, as you suggest. The Young-Laplace equation simply assumes that there is an interfacial tension - it does not help determine what it is. To do that theoretically you need to know about intermolecular interactions.

[@varunpuligadda8360]

Thank you !! I had a question, I need to analyze the interfacial tension in an oil spill that has occurred near the city I live in, how exactly should I use those measurements to calculate the interfacial tension. The oil that was spilt covered approximately 20 square kilometers.

[@BoffyBlunt]

If you had a sample of the oil you could measure interfacial tension using, for instance, the pendant drop technique. This does however require specialist equipment. You can also analyze the spreading of an oil spill on water - when the layer of oil is thin, its movement is controlled by interfacial forces.

[@teacup111]

Thanks for the clear explanation. Can you share how the units J/m^2 are equivalent to mN / m ?

[@BoffyBlunt]

The units J/m^2 are equivalent to N/m. This is because I J = 1 Nm.

[@SarwatTanzil]

when consider Pc why π(r^2)h is also considered for oil..water has risen till height h not oil

[@amirhoseinpahlevani8838]

Hello sir I have a question about the end of the video The relationship between IFT of the oil-water and oil-gas and water-gas is always true? or it works only under some circumstances? I'm asking this because this relationship is not correct for toluene and air and water. I mean this relationship; (IFT water-air)-(IFT toluene-air)=(IFT water-toluene) does not work I think I have misunderstood something I'll be appreciated if you could suggest me any article about this subject

[@BoffyBlunt]

This is only an approximate relationship assuming a gas, water and a non-polar liquid.. So do not expect it to be exactly correct.

[@amirhoseinpahlevani8838]

Thank you for your attention ❤

[@iammaa2008]

Thank you very much for sharing these videos. could you please share with me the valuable materials to enable me to taught the subject to my students.

[@BoffyBlunt]

Email me at [e-mail] and I can share written material on these videos with you.

[@hieuvan2952]

Dear Sir, what is the value of CO2/Water interfacial tension?

[@BoffyBlunt]

This depends on the temperature and pressure conditions, as well as the composition of the water (the presence of salts). See, for instance, doi.org/10.1016/j.enconman.2006.09.011

[@raghula5916]

Sir I am having doubt your telling oil and water have 50 mN/m if same oil and water composition measured at different surface will it be still 50mN/m or it will change

[@BoffyBlunt]

The exact value of the interfacial tension will depend on the composition of the two fluid phases (oil and water in this case) as well as the temperature and pressure. It does not depend on the solid surface properties - this affects contact angle. Interfacial tension between two fluids is only a property of the fluids themselves.

[@raghula5916]

❤️

[@SarwatTanzil]

when consider Pc why π(r^2)h is also considered for oil..water has risen till height h not oil

[@BoffyBlunt]

First, we can consider any two fluids 1 and 2, not water and oil specifically. In this term we consider the change in potential energy of phase 1 replacing phase 2.