How does soap water membrane thickness affect surface tension?

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Decreasing the thickness of a soap water surface while keeping the concentration constant typically leads to an increase in surface tension due to reduced molecular interactions at the surface. Conversely, as the soap water membrane evaporates, its thickness decreases and concentration increases, which can initially raise surface tension but may eventually lead to a decrease as the soap molecules become more densely packed and interact differently. The interplay between thickness and concentration is crucial in determining the overall surface tension. Understanding these dynamics is essential for applications in various scientific fields. Further experimentation and analysis are recommended to explore these effects in detail.
Chain Shawn
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Homework. Moved to Introductory Physics.
1.If the thickness of soap water surface decrease, whereas the concentration remain the same, how will the surface tension change?

2. If the membrane of soap water start to evaporate, its thickness become thinner and it’s concentration increase, How will the surface tension change?

Thank you!
 
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Chain Shawn said:
1.If the thickness of soap water surface decrease, whereas the concentration remain the same, how will the surface tension change?

2. If the membrane of soap water start to evaporate, its thickness become thinner and it’s concentration increase, How will the surface tension change?

Thank you!
PF rules require that you show us your best efforts in answering these questions before we can offer tutorial help. Please show us what you have done so far...
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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