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]

An excellent demo----and not ruined by background music. About perfect!

[@ibrahimsalih1512]

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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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[@awadeshsrivastava6991]

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[@billminckler6550]

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

[@PGIFilms]

When I was taking my General Chemistry courses I was *heavily* watching chemistry videos on TH-cam (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.

[@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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Thank you tons!!

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[@engineeringsimulationstudi1404]

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[@mazzeeew]

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You helped me a lot.❤️

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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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finally I could understand all about viscosity

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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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[@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

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Perfect

[@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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[@engineeringsimulationstudi1404]

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[@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 best intro ive ever seeen

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[@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.

[@giovannimariotte4993]

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[@engineeringsimulationstudi1404]

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[@engineeringsimulationstudi1404]

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