Duration 3:37

Surface Tension of Water Explained

by Wayne Breslyn

57 108 watched

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876

Published 23 Jul 2020

Surface tension in liquid water resists an external force because of cohesive nature (due to hydrogen bonding) of its molecules. Water molecules on the surface of water differ in that they can make fewer hydrogen bonds than water molecules at the center of the liquid. As a result the water molecules are more strongly attracted, and surface tension is present. Resources: Hydrogen Bonding Explained: /watch/Yn_RwFxJ8ZaJR Polar and Non-Polar Molecules Explained: /watch/4r_BWfXGFHOGB Surface tension is a common occurrence and of great biological importance (see https://www.usgs.gov/special-topic/water-science-school/science/surface-tension-and-water?qt-science_center_objects=0#qt-science_center_objects) . You can demonstrate surface tension by floating a paperclip on water (see /watch/)Q0Wzij86fC36W Surface Tension Diagram: https://commons.wikimedia.org/wiki/File: Wassermolek%C3%BCleInTr%C3%B6pfchen.svg Water Strider Image: https://commons.wikimedia.org/wiki/File: WaterstriderEnWiki.jpg Space Station and Water Surface Tension: /watch?time_continue=15&v=bKk_7NIKY3Y&feature=emb_logo

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Surface tension

Surface tension water

Cohesion

Water molecules

Hydrogen bonding in water

Hydrogen bonding

Cohesive forces

Water strider

Surface tension diagram

Comments - 60

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@rayanmg67524 years ago Great videos dr. B.
your videos helped me score 99. 1 out of 100 in high school chemistry.
i have graduated from high school a couple of weeks ago. 22
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@reecebailey35132 years ago You the man wayne. Taking a plant phys course and it' s a bit above my chemistry knowledge for some topics this helped immensely!
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@lightcapmath27774 years ago I ditto the other comments. 3-d modeling and clear explanation keeps me wanting to watch each and every video you create. 4
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@huzaifaabedeen71192 years ago Hi dr. B! How does soap reduce the surface tension? 1
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@ADNZ54423 years ago Thank you. Only video that explained it well. 1
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@noalune2 years ago Thank you so much! I couldnt find any videos that explained this well, im glad i stumbled upon this one:
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@user-zk3lc6ce8slast year Why does forming lesser number of bonds result in forming stronger bonds? 1
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@_Chafia4 years ago Thank you dr b:
it' s interesting & very useful to know about this. 2
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@udveetpatil80024 years ago Thank you, sir, for the past and present, and hopefully the upcoming future! 2
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@sameerrai97274 years ago Your video is very interesting and helpful for me
thank you sir. 1
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@raziyabadat74684 years ago Thanks! The explanation was good,
i have not covered this yet but it seems interesting! 3
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@badnaamboyzofficial4 years ago I love this concept a say a mysterious thanks to you. 4
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@WaqasAhmad-fx5wh4 years ago Sir in our chem book the definition of surface tension is
the surface tension is the amount of energy required to stretch or increase the surface sir i think this definition is wrong cox we says that the surface molecules are compressed and they are experiencing inward pull so the surface area should be decreased not increase. Sir what do u think it should be increased or decrease. ...Expand 1
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@huzaifaabedeen71192 years ago But how does the surface tension of water let it resist external force?
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@sushiman381710 months ago Woke up at 3 am with a sudden curiosity on how this worked. 1
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@kartvyasheth20874 years ago How did you run the simulation
did you program it yourself?
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@user-jz4jz6us5p3 years ago Isn' t the water surface supposed to be concave inside a container cuz the cohesion is downward.
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@zackaccount6 months ago Thank you. As a layman who has only a vague recollection of high school chemistry, this really satisfied my late night curiosity.
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@petarmajstor23702 years ago Finaly l understand! Lack of bonds on the surface make bonds itself stronger and that' s surface tension.
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@Khaledf3 months ago " because they can' t form many bonds those ( bonds are going be stronger"
those on the surface you meant? I did not get this point.
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@souravbhoi4184 years ago Yes sir, it' s the concept of the chapter. But first term is equilibrium.
but sir you adjust my request. So, many thanks.
i' m from india.
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@hanscarlosirch80443 years ago If i could give these videos two likes, i' d do.
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@WaqasAhmad-fx5wh4 years ago Sir in our chem book the definition of surface tension is
the surface tension is the amount of energy required to stretch or increase the surface sir i think this definition is wrong cox we says that the surface molecules are compressed and they are experiencing inward pull so the surface area should be decreased not increase. Sir what do u think it should be increased or decrease. ...Expand 1