How to Make Low Pressures with a Capillary tube
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- Опубликовано: 27 апр 2020
- In this video I show you how capillaries can decrease the pressure in a liquid well below an absolute vacuum if they are small enough
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*Any experiment you try is at YOUR OWN RISK. The Action Lab assumes no responsibility for any injury if you attempt anything you see in this video or on The Action Lab channel. 
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I have a feeling that he's slowly revealing his superpowers...
yes
I must say that lower pressure sucks.
If I were to be serious for once, I just wanted to say that your video ideas are always creative and fascinating.
Why are you here
oh it's you
Mumbo is also is missing his Original moustache
where's your brother
👋👋👋👋👋
I am a strong man.
but that thing
( *James's un-even mustache* )
it scares me.
Okay, so I'm not the only one who noticed that.
Hey! He can’t go to the barbers okay
My handle bars screamed when I saw that
Because it's not a moustache, it's what's controlling the main body you know as 'James'
am I the only one who feels like he repeats himself on every point like 5 times
That's how he makes sure everyone understands, even the people who consider themselves unexperienced at the topic at hand.
He's definitely teaching! And your definitely observant 😎
That just reinforces any un-sure viewers knowledge on the subject
It helps to grasp the points better.
longer videos get more money
Another great informative video and, THANKS for no distracting background music.
This was one of your best videos man. Thanks for posting!
i love this presentation of yours showing the capillary action phenomenon.
As I watched it, I kept thinking of veritas' tree video. Your explanation is simpler but better. Well done!
Loved this video, loved the veritasium video as well, thanks dude.
Next video:
"Honey! Now the neighbour is drinking from a ten meter long straw!"
@The Action Lab Wow cool thanks! After I first learned about hydrostatic pressure, it always bothered me how water could push down on the water below while adhering to the side in extremely thin tubes. This explains that quite nicely!
well, the meniscus are formed due to the adhesion forces and the surfacw tension of the liquid, which it was mentioned in the later part
but when the meniscus was mentioned first time( in case of the capillary tube), it is not due to the pressure difference but due to same reasons stated above
that's why water will always form a conclave meniscus with glass containers irrespective of any pressure difference
exactly what I'm thinking
And mercury forms convex
But again the minscus has that shape becuase of pascals law that force acting is perpendicular to fluids
Got this question when as a kid, no teacher or anyone answers me why, first time got the answers here, sounds new and right to me.
Thank you.
That's a nice detail about the redwood trees and explains why they grow only in coastal regions and why they are so large in California where the mist off the ocean travels inland so far.
Have you tried filling it until the capillary tube overflows but attaching another tube that feeds the overflow back into the large fill chamber. Would that cause a constant motion of it flowing into the fill chamber as it is pulled through the overflow tube via gravity and vaccum and capillary action forces all working in unison?
wow that kind of blew my mind, now i must bother my prof during office hours and see what he says
This is one of you most fascinating videos. (I never realized how geeky I was).
Awesome!
As a kid I loved the Egyptian water level. As an adult I used it for a massive decking project to set all the uprights in concrete.
It would be cool if the Egyptians actually used that type of levelling system. It might well explain a thing or two. 🇦🇺🤜🏼🤛🏼🇦🇺🤓🐇🍀
I think Veratasium made a video for trees and negative pressure. Very cool.
That part about redwood trees was so cool! I had no idea.
If you kept pouring it would the small tube overflow? If so could you run it back into the big tube and have a perpetual machine?
Awesome video!!!
Keep continue
And most importartly...
Stay safe
Wonderful analogy
After launching i was like, wait, didnt veritasium cover this?
Great video !
Hello!! Great video!!
Hey, nice video again, I like your channel for so long. Some people from abroad US can't fully understand you, and subtitles aren't very accurate, so when you mention the inspiration for your videos, like veritasium in this one, or Tom Scott in the last week "video about lasers" , some people won't really realize it. It would seem more fair to put a link in the screen. Thanks
Interesting content as always. Thumbs UP.
Love it :)
Wondering about the effect if the contraption was made of a hydrophobic material. I think it might be the opposite (?)
I’m so sad that you don’t make a lot of videos I just find them so fascinating
Woo super nice experiment
What if I cut the 2nd tube (highest)
A little bit below it's highest water level so it starts to flow out and connect it back such that it flows to the 1st tube (biggest)
Would that mean it would keep flowing?
Thank, now i know how make below 0 absolute presure vacum
Awesome explanation ♥️👏👏👏
So if the capillary force makes the water level rise higher than the other water level what keeps you from flowing the water from the capillary tube to the other one to get perpetual motion?
flatearthers : " THIS IS CGI! WATER ALWAYS FINDS ITS LEVEL!"
He really should start another channel where he teaches actually interesting chemistry and/or physics classes for high school students
Nice video thnx for sharing! 👍
Thanks for dyeing the water!
This was so interesting ✌️😎👍
Finally, to understand capillary better than just theory from our SCHOOL teachers
This one was a proper explanation, finally. 👍
Actually it was a very poor depiction of what really happens, the term relative pressure is only relative, and the entire explanation was lacking.
Just amazing example 👌🏻
Hi action lab 👋 i liv ur vids .. ur my inspiration and bcuz of u I was interested in science..U were the reason I decided to become an astrophysicist Im stil 15 tho... Hope u read and comment this(comment optional) Btw it says actionlab is closed! On ur store.. I really want to buy some stuff so can u open it again ... I am from India.
Salute and hatsoff to u 😎😎😁😁😁😁😁👏👏👏👏👌👌👌
Cool video!
6:44
I was thinking if I should leave a comment about varitasium's experiment and you said it just at that moment😃
I was about to say this reminds me of Veritasium's video, and you mentioned it
wow way cool, good thing straws aren't that long :)
How does come up with soo many ideas mann he would be the perfect partner for a science fair
Can you make this way water to flow continuously? Like including fabrick to suck water and drop it in a larger section?
Do you think you can do cold welding between to clean metal surfaces like what happens in the vacuum of space in your vacuum chamber?
with all the negative comments that exist on RUclips, here is a positive one for you.
You are awesome!
If I have a 3 way split evaporator using the 0.031 cap tube at 120 inches. Will the other two cap tubes be the same size and length or will they need to be different lengths to achieve design pressures ?
Instead of glass, if you used a more hydrophilic material for the tubing (e.g. wood) would it pull the water up more? The reason I ask that is because the interface between water and any other material always creates a type of meniscus of some thickness which varies in size depending on how hydrophobic or hydrophilic the material is. The meniscus doesn't just happen between water and air although by definition the interface between water and air is given the term 'meniscus.' I'd be curious to see this experiment repeated with wooden tubing. :)
try Rain-x, make your glass surface hydrophobic, redo experiment, measure differential coefficient of friction via your change in miniscus... You get the drift.
You do the coolest things
What happens when the glass in a capillary is coated in a hydrophobic material? The capillary effect would not longer work, correct? If that is the case, then materials that are more hydrophilic than glass should produce an even more dramatic effect?
The flat earthers should watch this, just so that they can see that water finds separate levels.
I can already see it: you have not thought about your comment properly. pity. look back and go to nature and see why it is possible what you see. because you think you can see but you only see what you want to see.. I do no reply.
Read my mind.
Flat earther's have already done their own experiments to prove the earth is round and have thrown out their own evidence. While this is a great proof against their argument, sadly they are doing science backwards. They already have their answer, now they need to find evidence to support it.
Just know that unfortunately, a straw cannot be longer than 30 feet. My dreams have been killed.
it can if there's already water inside of it since the beginning like how trees work although that means you d akready have water in your mouth so.....
edit: oh it was already mentioned in the video
@@mpred8606, no... doesn't work... After about ten meters, whatever force you use to suck in, the liquid will not go up.
It sounds like the ten meters is only a vertical limit.
@@mpred8606 Nope. Around 30' is the limit of water head at sea level. Doesn't matter if there's more than 30' water in the tube or you have a mouth full of water before you raise it vertical, air pressure can only support a column of water around 30' high and so it would fall leaving a partial vacuum above it.
Capilliary action is a force generated between the liquid and the tube wall, surface tension limits the height the liquid can rise and the greater the diameter of the tube the less the surface tension can support a column of liquid under it. No negative atmospheric pressure there.
@@alexandrudanciu7874 no I mean it wont work what I am saying is how like the trees from beggineng bassicaly have straws that get longer and longer it doesn't get stuck at 10m because there's no air ti cause tha liquid inside to boil its bassicaly in a super vaccum
Finally another scientifically video after of such a long pause🙄😊, All others were just... you know; not about science. (this one was good) 👍
@The Action Lab So, what would it feel like to swim in it if you were to scale that experiment up so that the smallest tube was the size of a pool?
Great man
8:10 he has an uneven mustache🤪
Is it possible to change the colour of metal from reflective to opaque ?(sorry not able to explain what I mean in better words) Like those glass panes that become frosted when you click a button.. and on a different note how do these glass panes even work ?
Can the smallest tube be bent over and then down a little where gravity would pull drops down to drain into the largest tube, like a forever fountain?
what is exactly adhesive force
Can perpetual motion be used using this method?
Hey action lab, here's a idea for your next video,"try keeping water in a vacuum chamber and dipping the vacuum chamber in LN2". Please try it!
of course my mind immediately wants to know if you can make the skinny path pour back in to the large one perpetually =P
Could this be used to make a gravity battery it might be extremely slow unless you had a whole bunch of tubes
Is it possible to use capillary effect to siphon back to the main tube and let it go... forever?
Cool Video
I have a question, if a black hole suck into it everything with mass, and if you placed a small black hole a question, if a black hole suck into it everything with mass, and if you placed a small black hole on earth it would suck in the earth as well as the air since it has mass, if it did what would be left except for the black hole if everything got sucked in?
Pressure is an emergent phenomena where molecules randomly colliding into one another at a microscopic scale. The natural question to ask is, what's going on at the microscopic scale for the negative pressure?
The answer depends on your fundamental understanding of the term negative pressure, if it is understood as relative negative pressure then its essentially particles colliding just less frequently and with less kinetic energy compared to its surroundings. However if understood as negative pressure then unfortunately no such thing had been proven to exist.
@@asemhisham3507 wht about negative volume
@@asemhisham3507 Theoretically, it may be possible in the realm of statistical thermodynamics, but only extremely locally and not at all on any macro scale. The caveat is however that the probability is so low as to be non-considerable. Thought conundrum: if all the molecules gather to one portion of a volume could the pressure elsewhere be less than what exists between the molecules natively? Of course, though, the question has no meaning.
Negative pressure means tension instead of compression. Of course you can’t have a negative force. The force is acting in the opposite direction, but since we use the word pressure to typically mean push instead of pull, it’s technically correct to say negative pressure.
Water displays apparent "antigravity" properties all the time. Just think blotting paper or a drop of water hanging from a tap. Nothing to do with air pressures at all but just reminding us that molecular attractive forces can be much stronger than gravity. Air pressure is only relevant if we try to draw water up a pipe that is not open ended. As far as very tall trees are concerned I'm sure I read somewhere the extra lift beyond capilliary action and evaporative "suction" is achieved through a series of open and closed valves in the trees structure.
I love your vacuum experiments and watch them regularly. Can you try this in your vacuum chamber - I'm keen to see the results.
Will try this on IIT aspirants.... at least it woul reduce some stress on them.
Hey there i have heard that pressure in 1 meter deep in ocean water is the same as 1 meter deep water pressure in a narow container sooo is that right 1 meter deep in pool vs 1 meter deep in ocean is the pressure same?
Can you put this tube and pull a vacuum? Would the excess heights change?
Where did you get that piece of glassware? That would be nice to have on my desk to explain
Can this capillary force be used to make one of those perpetual self pouring flasks? (Probably not but i still wanna ask!)
I'd like to see more about increases in pressure.
Try the same experiment but using tubes made of teflon or some other hydrophobic material.
What would happen to the capilary height in lower atmospheric pressure?
i think its surface tension, not pressure
In trees not only the capillary force that help in taking above but the adhesive force also helps in that
Can u make a infinity water loop with this stuff
The only useful thing I got from this video is that it reminded me to water my house plant. Thanks!
Nice video
my new science teacher while on quarantine 😂😂
Be very careful accepting what's shown here without a critical mind. As has been pointed out elsewhere there are fundamental flaws in the explanation.
What will happen if you place the glasstube in the vacuum chamber?
I dont understand it, maybe because I am sleepy.
I will watch again tomorrow 🛌
(I am a Great fan of action lab)
Bending the capillary will make some running
Or siphoning will give some motion once it's starting
Try this
Please upload a video of stress strain curve doing an experiment ....
HUH. So... ever- flowing heron's fountain may be possible? maybe if the smallest tube was curved to feed into the big fountain it would flow on its own until it evaporates?
I always enjoy your videos. So as a follow on to this video, can you explain HOW an WHY capillary action gets its force? What is actually happening at the atomic level? And one other question...are you a teacher by profession? What do you do for a living?
The force is due to the atomic attraction of the water to the glass through adhesion. it attracts it so much that it gives the water something to hold onto so that it can actually be under tension and not fall apart. Also, by profession I am a chemical engineer
How the glass pull the water up?
If you put soap water, the result would be the same?
Anyone wondering what if the thin glass were bent & poured into the big one?
I was waiting for someone to say that
Make enough of them connect together to form a drip that can fall!!!!!!
Me too, but i think the capillar effect and surface tension would hold the drop together, so it can't drop. The force that is needed to overcome the effect will cancel out the gain of potential energy from the water height difference. But its only a guess. ^^
@@melonenlord2723 Either way, it's definitely impossible, at least infinitely, as that would be over 100% efficiency, and we'd be using it for free energy.
@@jordanbwalt humans know very little about the world around us, yet we are so arrogant we make up 'rules' that prevent others from questioning
By embracing the dark side of the force
The shape of the meniscus is caused by the wetting angle or the hydrophilicity of the glass capillary. With mercury the contact angle would be much larger.
This is the same principle used to create the "lighter-than-air" material known as Aerogel. Basically, it starts as just a block of amalgam, until the liquid is evaporated from the voids. Once the evaporation has taken place, the voids are so small, the air pressure within the matrix left behind is of a lower pressure (amd subsequently less mass) than the surrounding air... so the matrix itself actually 'weighs' less than than sum of its true mass.
Is it true that deionized water has higher melting point and how to prove that?
This seems like it’s borderline hovering in the realm of a perpetual motion machine. If the capillary tube, which has the highest elevation could somehow be directed back to the wider source tube. I’m guessing there is something in the physics about that distance you mention, especially showing how it retained that distance in the capillary tube after draining it. Just a thought, if the capillary tube had bends in it, would the liquid travel the same distance, or match the height from the previous experiment?