Viscosity, Cohesive and Adhesive Forces, Surface Tension, and Capillary Action

Liquids have some very interesting properties, by virtue of the intermolecular forces they make, both between molecules of the liquid and those between the liquid and some other material they are in contact with. Let's learn about viscosity, cohesive and adhesive forces, surface tension, and capillary action.
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[@patcotsman866]

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[@davoodbarzegari4080]

thank you for the very simple explanation. I am an engineer and used the concepts for years but I understood completely now.

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SImple and clear. I must have learned all this in high school, but until seeing your video I could not explain it. Excellent video. Probably not for the the complete novice, but excellent for a student studying the subject.

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[@stormingsharks]

How convenient is it, that I missed the chemistry lecture explaining these IMF relationships for liquids (don't ask me how, it's embarrassing), just to see Professor Dave upload a detailed concise video explaining them the very next day?
You're my favorite, Dave.

[@engineeringsimulationstudi1404]

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[@aksaxena1000]

Perfect and Simple presentation. Thank you

[@PGIFilms]

When I was taking my General Chemistry courses I was *heavily* watching chemistry videos on CZcams (2-3 hours a day for about a year: you, Bozeman Science, Tyler Dewitt, The Amoeba Sisters, Khan Academy, Cody's Lab, Nurdrage, NileRed, etc.) and saw just about every one of your older chemistry vids. Was wanting to maintain and build on my chemistry knowledge (Gen-Chem was my science elective for my Associate degree in Business and thinking about going back to pursue a more advance science degree) so it came as quite a shock when I saw the new haircut... I suppose it cuts down the countless "Thank you chemistry Jesus!" comment that I kept seeing on you vids. =P This vid really added to my knowledge since my Gen-Chem courses did not have any detailed emphasis on these liquid properties, they were covered briefly in lecture, but was never put in a quiz or test.

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FANTASTIC EXPLANATION of several aspects of liquids. AWESOME!!! ❤

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Thank you for this lesson Prof

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Thank you tons!!

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Pacing is perfect and it goes in a very logical way. Thank you!

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[@A_J___]

I started working in architecture 8 mos. ago and when I first started, the detailed drawings of how specific assemblies go together looked so alienesque. I've been learning that a building goes together the way it does largely to mitigate the intrusion of different environmental forces like moisture, sun, and wind that work to deteriorate a building. The more effective a bldg is at resisting these natural forces(due to being assembled correctly with appropriate materials), the less money the owner/operator of the building has to pay over time in maintenance/repairs. When you own a home, you essentially operate a building and part of being able to afford a home not only includes paying the mortgage and taxes, but also the cost of maintaining the home itself.
With that being said, certain parts of a roof is designed the way it is not for aesthetics, but due to surface tension and capillary action that wants to drive water into the building that must be repelled by thoughtful design...that can also look nice as a secondary function. Before starting architecture, I had no idea how much building science informs design.

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Your intro is the best part of the video!

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Thanks for the visual explanation

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Thanks a lot professor Dave for such easy and wonderful explanation

[@engineeringsimulationstudi1404]

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You helped me a lot.❤️

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[@amjidhussainthebowamjidhus8567]

finally I could understand all about viscosity

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[@Ezmody]

Can you make a video about rheology (shear stress, shear thinning, shear thickening, ...) ?
Awesome video btw!

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I have to say this is very interesting as I am a food science student water is very basic and important ingredient. Thank you for explaining

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[@adityaadit2004]

can you explain why surface tension formula is y = F/2L? why there's 2 in it?

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and he comes to save my grades once again!

[@jsk1911]

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[@engineeringsimulationstudi1404]

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can you explain why water doesn't fall from an inverted tumbler if we place a strainer at the mouth of the inverted tumbler??

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thankyou so much

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SUBCRIBED because the example is too perfect

[@engineeringsimulationstudi1404]

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May God bless you bro!

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Perfect

[@mddelman]

Very informative video, thanks. Do you have time to answer a question for me? I have a small vessel filled with water. A thin tube (1.5mm inner diameter) hangs an arbitrary distance below the surface and the top is attached to a valve that allows me to release ink into the water. When the valve is open, ink flows freely. When I close the valve, a vacuum is created at the top of the tube, so the flow of ink stops. However, through what I assume is capillary action, water from the vessel is pulled into the tube, apparently displacing ink, which then leaks into the vessel. This continues until all of the ink in the tube has leaked out. My question is, is there any way to prevent this leakage from happening? I cannot change the viscosity of either the ink or the water. The tube could be modified if that would help, but not to the extent of using a much larger diameter tube.
I hope you find this question interesting and I'd be most appreciative if you can answer it. Thanks very much!

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the perfect video

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Heartly thx a lot dear sir...

[@engineeringsimulationstudi1404]

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[@Bahrzy2002]

Does surface tension also resist something trying to exit a blob of fluid?

[@schifoso]

While watching I thought "what about surface tension"? Answered. Then I thought "what about water going up a tree"?. Again, answered.
You have a knack for providing great examples. Thank you.

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Itz capillarity

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[@user-zg5xv3wu9b]

there is an android app play market called Viscosity calculator (by Tarbanov) that calculates dynamic viscosity of water solutions in respect to temperature and salinity

[@hdevillier5119]

Question: I watched a video by Action Lab not to long ago describing capillary action. If I remember correctly, he mentioned that the air pressure in the smaller tube is lower, further minimizing the forces acting against capillary action. Is this correct?

[@ajax9467]

it is - if there some pressure acting on it, the water wouldn't come up as easily. as mentioned in the video, on a large enough scale adhesion and cohesion can be outweighed by other factors such as gravity, pressure seems to be one of them.

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[@engineeringsimulationstudi1404]

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[@julesderuelle7819]

Hey Dave!
Thanks for the video :). I was wondering if you could answer a question. If I put water in a non-polar container, such as plastic, would that mean the meniscus would become convex since the cohesion is greater than the adhesion?
P.S. I as asking this because when I google this situation it says that the meniscus would be neither. It says it would be flat?!

[@tom_winguill]

A convex surface will be formed with decreased level of height than the rest of the liquid

[@learnwithanurag9648]

Sir, I had one doubt. What are polar and nonpolar surfaces?

[@shivasmart967]

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