7 Science Tricks with Surface Tension
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- Опубликовано: 2 авг 2024
- Surface tension holds the surface molecules of liquids tightly together and makes for some fun experiments!
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Thanks to my mom for filming
Music: "On the Bach," "Bluesy Vibes," "Good Starts"
I think I know what was in your coffee that day. Soy. Soy proteins can do the same thing as the soap in your home experiment.
and also some kinds of oily flavours (like the ones on starbucks)
yeah, i noticed it in my tea too just today. maybe the temperature helps with that?
Thank goodness I haven’t drank soap for years.
Or any other kind of emulsifier
If you put water or milk in very hot pan these drops appear then to
I asked my mom for adult supervision to try this. All she said was you're 30!!!
wow u have 30 likes rn lol
I would like this comment but I dont want to ruin the 30. If you lose or get a like ill like it but dont forget to reply to this comment or I wont remember ;)
Emperor Kosi peep peep like bait
now you have a stack of likes
@@kidskpadonou894 okay, like now
What? Why talk about age??
The last one we have always seen , while making “dosa” in India 😂
😂😂😂yes
Yasss😂
Yea
I love all your videos, they're great. It's such an important thing to be doing: making learning about science entertaining.
The thing I find most fascinating about surface tension is how, at small scales, the major force acting on life is not gravity, but surface tension.
Thanks a lot Dianna!! I really appreciate your interest and enthusiasm to teach science in a very interesting way. I just love your videos.. Waiting for more of them.
In Fluid Mechanics, there's a dimensionless number that measures the importance of Surface Tension relative to Gravitational Forces, it's called the Bond Number. A very high Bond Number means that Surface Tension is not important. A low Bond Number (lower than 1) means that Surface Tension dominates. This is what happens with small bubbles of fluid because Bond Number is proportional to the square of the characteristic length in the geometry.
Today is my first day as a Teacher's Assistant and I'm sharing some of these experiments with the students. Thank you so much! This video was fun!
crisp and clear video which has no irritating intro and wast of time
hats off!!!
Huge improvement in video quality! Camera Upgrade? If so, what kind did you get? I've been looking into cameras lately... super expensive and I'm kind of at a loss on what I should get. It's a lot of money to spend on potentially the wrong camera. Unfortunately, I have no one around here that can help even with good suggestions.
P.S. Good video :-) I've only tried some of these myself. I'll have to try the others soon.
***** Heya. Nope, still using the same camera from the last year or so. It's a Canon 7D. I've just gotten better at using it lately. :)
Physics Girl Nice! :-) Super expensive camera, although not too far off from what I was figuring I'd have to spend.
The Science Asylum great
Hi crazy
You are great Science Asylum
Love your explanations.
All your videos are fascinating and fun! Thanks for helping me love physics even more! I hope you feel better soon
Another great video Physics Girl! I might just have to try a few of these experiments myself sometime! :D Keep up the good work!
If you have soap in a polar liquid (like water and by extension coffee) the unpolar part of the soap molecules will point outwards because the polar parts "want to be in the water". So you have a hydrophobe layer on top of the coffee. My guess is that the bubbles are basicly soap bubbles that are created by the stirring and have their polar sides on the outside, so that the unpolar film on the coffee rejects the bubble.
TheNerubin That is what I was thinking, but you said it better than I could. Kuddos!
+TheNerubin It's called forming micelles.
Well, I think +TheNerubin is correct in calling them soap bubbles in the #coffeee. +axxization: a minor correction: Micelles are (strictly defined) soap-water interface structure (www.dataphysics.de/2/start/understanding-interfaces/basics/surfactants-and-critical-micelle-concentration-cmc/) while bubbles are soap-water mixtures with air interface (en.wikipedia.org/wiki/Soap_film), more like the coffee. @PhysicsGirl is AWESOME.
Exactly
what about the fact that they only stay while moving and pop when they stop?
Hello Diana-
Love your work! Thank you!
2 comments about your surface tension vid...you can do the screen over the jar with just a square of screen held over the mouth of a drinking glass just like you do with a paper. No need to attach it with the lid. Just make sure that the screen is only a bit larger than the diameter of the glass and that it is quite flat, not bowed.
And...make a paperclip holder out of another paper clip to place the first one on the surface tension of the water. To do this, unfold a paperclip and bend the ends to make 2 parallel "arms". Place the place the new paperclip onto the arms and slowly lower it into the water., and,...shaboom! The unbent clip will float on the surface tension. I have found that the metal clips work just as well with this method as do the plastic-coated clips!
Happy Science-ing! (yes...I stole it form you. I'm not proud about it, but there it is.) -Ian
niiiiiice...
Ha les tensions de surface, c'est vrai que c'est marrant, j'imagine déjà une future vidéo e-penser en français cette fois sur le sujet en élargissant peut-être à ce qu'on peut observer dans la nature (les insectes qui marchent voire même courent sur l'eau par exemple). Enfin je dis ça, je dis rien :P
C'est vrai que c'est génial et me fait même penser aux expériences du Dr Nozman en France. Par contre je comprends pas grand chose >< vu mon niveau de compréhension orale
Hehe pas mal!
C'est pas mal la réactions des liquides.
Sinon tu feras une vidéo sur les liquides non newtoniens? C'est drôle comme truc ;)
Loïck Del Heureusement elle utilise un vocabulaire simple.
ZEL0D Ouais mais l'anglais à l'oral j'y arrive pas. Autant à l'écrit ça va bien mais l'oral...
Thanks so much for creating and sharing this educational and entertaining video.
I hope that each day you are feeling better than the day before 🙏
Pretty awesome stuff! I'd seen a few before, but others were new to me...
Would love a video on what surface tension is, and how those experiments actually work. Also, how soap affects the tension in the water.
This is a great series of experiments that are more about observation than trying to explain things. Observation is what initially motivates working scientists and the rest is a lot of hard work trying to figure out what's going on that eventually results in an exciting explanation that maybe nobody knew before. But first, you have to hook a potential scientist and this set of activities does the trick. There's evidence to support that in the other comments here. Thanks, Physics Girl! Another awesome job!
Oh God, I've discovered #2 last year while drinking coffee as well! I've wondered for a bit about it, thought it has something to do with surface tension but that's where my knowledge and resources ended. I got so excited when I saw it on your video! Hopefully answers will come!
OMG thank you so much I really needed this video for a science experiment I am analyzing. THANK YOU!!!!!
Thanks for posting. :) I needed to find the paperclip experiment and this was the only video I have found!
For 2, the soap decreases the surface tension to allow "thicker" bubbles to form, which can hold more opaque compounds such as lactose or cocoa.
The last one is actually the Leidenfrost effect. The pan is so hot that during the impact, a vapor layer is formed between the droplet and the pan, which makes it possible to "levitate" the water droplet. The droplet and the pan don't have any contact. Pretty amazing!
Nice video!
For the second experiment, I might have an idea.
I did a bit of research on that and found that soap contained some oils. But since soap seems to mix with water, I tried to find out how oil mixed with water. After some research (which is a few minutes of googling) I found that if you put detergent/soap into water, it is attracted to both oils and water, so it can help them combine to help form something called an emulsion.
But that didn't explain why there were those circles floating on top of the water. So I though maybe by flicking something onto the surface, you could separate the water and the oils inside the soap again, so the oil would float on top. But then the detergent/soap would combine the two liquids once more.
It may be a long explanation, but that was what I found. Hope it helped!
Thank you for doing the experiments in such a lovely way
Thanks! I love seeing experiments like this!
the last experiment was mind bending!!!! thumbs up!
Nice channel, very cool stuff. I've created the water spheres you did in your second demo using acoustic disturbances in one of my own videos.
Welcome to the internet.
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cody ko
I love all your vdeos, they are . always interesting and fun to try ourselves.
My absolute best regards for filming to Mom.. Great job there.. Salute! :)
Awesomeness extraordinaire! Love your content...all of it.
Cool video! Studying for my chemistry test and found this. Cool video and sure as hell made this a lot more interesting than my Chemistry teacher.
Keep up the good work!!! Love your videos!!!
So glad I fell into this! Informative and funny! ❤
Good to see how the channel is growing.
Nice channel very cool stuffs....I did the same experiments u did and I was really amazed to see all that....thanks a lot
Hypothesis on soapy bubbles in the coffee: Coffee 🍵 (& oil based paint 🎨!) is a naturally oily liquid. Soap washes grease from skin and other surfaces by trapping the grease in little bubbles and allowing the water to rinse off the soap-trapped oils where water doesn't mix with oils naturally (over-simplification without going into chemistry diagrams). The soap (or soapy film) must be trapping the oils of the coffee into bubbles temporarily which then roll across the surface of the oily coffee bean steeped water. An interesting experiment to test this would be experimenting with different concentrations of coffee steep and seeing if the affect is made more dramatic when more oil is present in the liquid. My thoughts. Thank you for filming!
you are so amazing I love your videos!
Hi there,
thanks for these experiments, I've tried them all and they've all been very interesting in helping understanding how surface tension works. Couple of questions on the milk one though:
1) how many attempts did you do before a perfect one like the one in the video showed up?
2) how deep was your plate? Is it correct my assumption that the more shallow the better?
3) and this is the most important: why milk? My only guess is that food coloring tends not to mix with milk, unless you stir it, and it's quite visible, way more than in water. But apart from these reasons, milk has fats, which I've read somewhere are supposed to lower the surface tension, so the effect should be less visible than in water. Any help?
Thanks!
Wow! Nice work!
Thanks for these. They'll help me plan experiments for home education group next week.
Making a point to watch every Physics Girl video that comes up in my stream. Hoping you get better soon!
I love the milk fireworks one! I tried it on my own and it was so cool!
Loved your experiments💥💥👏👏👏
Nice video! The first one was fascinating!
Superb prestantion ❤❤
I loved it
i discovered your chanel with E-penser. You are doing a super job. I'm going to improve my physics and english knowledges with you.
I just have to say, your videos are amazing and i love them. When i saw the email that said you had this video i was so happy, but sad because i couldn't watch it, because i had to take a quantum mechanics quiz (Which also made me happy)! :)
Noah Blacker Hope the quiz went well!
Cool video! I was doing a poster on surface tension and had never seen the water upside down trick done with a screen before. I tried it out and it worked! Really cool. Also tried floating paper clips on water. Then i put a soapy cotton swab in and the paper clip sank, just like it is supposed to. BUT when i tried the water upside down experiment with soapy water or poking a soapy needle into the screen, it still worked. Even with more soap mixed in the water, then turning it upside down, it still worked. Shouldn't the lowered surface tension cause the water to spill?
Maybe the air pressure difference still plays the bigger role than the surface tension in this experiment? I could try it again with alcohol mixed in the water, that should also not work.
+1 for "penny dropper" hahaha.
I do have one question; if soap breaks the surface tension, why does the addition of soap *allow* you to make bubbles? It would also be cool to talk about the vapor barrier created on the hot pan and how the air is a less efficient conductor of heat (so it remains in a liquid state). Great video, but more science is always better! :)
AMAZZZZZZZING .... we need more of these videos
Very cool experiments!
When I was a about 12 I was sitting in a row boat on a slow moving river and my nose started to bleed. I hung my head over the side of the boat and the drops of blood landed on the water and formed small balls on the surface, like those on your coffee, The drops of blood drifted away from the boat and after a while burst, at which time they disolved into the river. It was a fascinating moment.
I really like your videos , you present it in a very nice way (Y)
Physics Girl
Bazinga, ya got me. Love the vid!
Wow so cool I am definitely going to check this out
I love this channel. That is all.
Hi are u alive
CHECK OUT MY ORIGINAL SOLUTION TO A TRICKY SURFACE TENSION CHALLENGE HERE:
ruclips.net/video/8GHtxOdUkXE/видео.html
Good Job (from France) ! I like this episode :) !
Thanks for science infotainment. Keep it up!
soo awesome...m definitely gonna try these experiments in an upcoming science fair. Thank u so much wonder girl!! Oops i mean physics girl :)
Very nice. You should try touching the underside of the screen on your inverted jar with the soapy Q-tip. Interested to see how quickly it pours out.
Or maybe it doesn't- perhaps the water that beaks out where the surface tension is broken takes the soap away and then it's stable again.
Or maybe the vacuum sucks up air where the surface tension is broken and thereby mixes the soap through all the water and it all runs out.
I'd love to know which but don't have a bit of screen.
Awesome videos!
What type of Mesh are you using?
This Physics Girls is fun and delightful and interesting. More power to you, Physics Girl! :-)
Great stuff on Surface Tension.
I am unable to find my brain after i saw your last experiment .....1 . amazing
2. mindblowing 3.fantastic
hoping for more new videos from the best youtube channel
perhaps the motion of the drops plus the internal fluid dynamics keep the drops from breaking the surface tension of the original fluid? maybe the flick of the straw keeps the drop moving on the inside fast enough? awesome videos keep up the great work!
The chicken at the end is so funny!! Also I’m gonna try all of these experiments!! Thanks.
Cool, thanks! The paperclip is awesome. But the screen holding up the water is mindbending.
wordsnwood Agreed. It's hard to believe that it actually works until you try it!
More than the experiments, I love the way you say(present) it .Really Cool, mm yeah :)
Love these experiments!! We tried the soap in milk effect and my son named them “soap minions”. Thought you might like that!
I use a Chemex pour over to make my coffee in the morning. As the last bits of coffee fall out through the filter they make those spheres on the surface of the water and skid around for a while before plopping into the coffee (I usually watch it for a minute or too). I only wash the Chemex with soap about once every two weeks so I have a feeling that the effect is possible with only coffee. I wonder if the freshness of the coffee changes the effect-- as I grind decently fresh roasted beans-- and whether or not the cream/milk you added to it changed it at all. Regardless, these were all neat demos, and I guess I have more to think about when making coffee. Thanks!
Hi. You are such an inspiration
This channel's growing! So exciting :D
You can also create #2 using a water filtering bottle. Mine is the Brita brand, and if you watch water drop from the filter to the surface, small round drops of water will bounce around if the surface of the filtered water is close enough to the filter outlet.
I tryed the milk firework and It WORKED!!! So cool
#5 I use a second paper clip (which I bend) to place the floating paper clip onto the surface. That way my hand's natural trembling (amplified by being nervous in front of my students) doesn't affect the positioning as much.
I love your videos. Thanks for sharing them :)
Swiftynine you're welcome!
The pressure changes caused by the stick causes sudden waves and displaces the molecules in the uppermost layers of the film since they are relatively loosely bound as compared to those in the lower layers.These molecules are consequently replaced by the molecules from lower layer. The molecules form their own spheres due to surface tension which float over the film and move in the direction of net resultant waves.
this channel is totally awesome
your coffee-soap demo is due to you mechanically lifting small amounts of the coffee surface which has the hydrophobic ends of the soap molecules at the coffee to air interface so when a drop falls from the stirrer it is a drop of coffee with a "coating" of the hydrophobic ends around it, when it falls back to the coffee in the cup electrostatic repulsion keeps the drops "floating" on the surface.
These are really fun! :)
I've done the last one before..it's actually fun😁
Wow your so smart, Love your videos :)
What a nice video at the end of the day to help me decompress. 😛
I noticed the second one when out sailing in 1989. The water splashing from the bow wake would sometimes create that effect. I had recently learnt about the planetary Roche limit, so I called it the Roche Hydrodynamic Effect. I still haven't found a paper that explains it.
From 0:43 to 0:48 notice that the larger bubbles absorb the smaller bubbles: the air pressure in the smaller bubble is larger, pushing air from the smaller to the adjacent larger bubble (through the membrane separating them). See Discrepant Balloons by FlinnScientific. The same happens to connected soap bubbles (see my "Unit 5 Fluid Experiments" at 5.40 min) and to the foam bubbles on top of carbonated drinks.
hai +physics girl i really interested in your channel. this was a great video with lot of fun.... also one funny thing is that the last bonus experiment u made me go back to my early teen age... i used to do that hot pan 'n' water trick when i was making omelet and bull's eye...... at the great time back...
:-)
The water droplets in the pan at the end is so cool! but i don't understand why it works!! can you tell me Physics Girl?
Your smile is amazing! But I also love your love of science :D
I think that droplets of a liquid dont mix instantly when they are in contact with it. And some factors can prevent them from mixing, like waves in the surface of the liquid. Cool to see that different liquids also extend that stability time, even without the waves :)
Who would knew that there is so much beauty in you!
I tutor ochem and one of the first concepts is surface tension. I like showing videos as examples of chemistry. Thanks
Your mother is a natural with the camera. The rooster is just trying to hog your screen time. Another great video. BTW, the e-mail updates for your new vid releases work great!
Glad to hear that!
The only thing I could possibly imagine happening as far as the "antibubbles" is that when you put soap in the drink you create and incomplete hydrophobic layer across the top. The ball stays on top until it finds a hole in the hydrophobic layer then falls through. It lasts longer when you have a lot of motion because it's harder to find a hole. I could be wrong but that's using my education as far as organic two. And my bio classes thus far. I thought the penny trick was interesting I thought I was the only one that found that cool I did it all the time as a kid. Anyway as a new subscriber great videos!!! It makes me slightly less apprehensive about physics next semester. Thank you so much.
Man, if back at school I had a teacher like this, I wouldn't have that much problems with physics lol
Wow you got a new symbol for Physics girl. Anyway when did you going to explain all these phenomenon?? Cant wait for those video. !!!
Physics Girl, I love your videos 😆.... Wish I took physics in high school 😒
This is the coolest video ever
Have you tried the coin one with a ring? it looks pretty cool