Sir in the scientific paper to establish realation between gamma LV and H you have used the Youngs equation. To get youngs eqaution we have balanced only surface tension forces but why the weight of the liquid column is not considered.
This is interesting indeed. If you wish calculate the height by a force balance, as is usually done, then the contact angle becomes important. Without that there is no vertical force component that will balance the weight of the liquid column. But if you calculate it by energy balance, as I have done here, you can neglect the curvature of the meniscus as it cotributes only a little to the volume energy or surface energy. But then the final result comes in terms of liquid-glass and air-glass interfacial energy. If you wish to present the result in terms of liquid-air interfacial energy then one again has to bring the contact angle through Young's equation.
Very good Afternoon Sir.... I am preparing for Gate exam (XE paper) first I take your lecture and then go for William D callister book that is sufficient for Gate Exam ... Please sir help me out if this is not sufficient ......
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Excellent teaching sir. Wonderful explaination of concepts. Thank u so much
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Sir in the scientific paper to establish realation between gamma LV and H you have used the Youngs equation. To get youngs eqaution we have balanced only surface tension forces but why the weight of the liquid column is not considered.
Is this capillary rise same as in soldering process?
Yes, at the fundamental level it is the same.
sir in capillary rise height term we also have a contact angle term which does not come here why?
This is interesting indeed. If you wish calculate the height by a force balance, as is usually done, then the contact angle becomes important. Without that there is no vertical force component that will balance the weight of the liquid column. But if you calculate it by energy balance, as I have done here, you can neglect the curvature of the meniscus as it cotributes only a little to the volume energy or surface energy. But then the final result comes in terms of liquid-glass and air-glass interfacial energy. If you wish to present the result in terms of liquid-air interfacial energy then one again has to bring the contact angle through Young's equation.
@@introductiontomaterialsscience Thank you sir for this clarification. I get it now. Excellent lecture series by the way. Thanks again.
sir is gibbs free energy conserved ??
As it decreases in any natural process it cannot be conserved.
Very good Afternoon Sir....
I am preparing for Gate exam (XE paper) first I take your lecture and then go for William D callister book that is sufficient for Gate Exam ...
Please sir help me out if this is not sufficient ......
Callister's book should be sufficient.
@@introductiontomaterialsscience Thank you Sir...
Lecture videos give a very clear and lucid outline of whole chapter
Thanku sir
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