Does Vacuum Suck?

After watching this video, you will never think about drinking out of a straw the same way!

[@HandbrakeBiscuit]

To be serious for a moment, this video serves really well as an example of how the scientific process works. I find it more valuable for that reason than the specific knowledge it imparts regarding air pressure and the pseudo/apparent 'suck' due to vacuum. I like the inclusion of the history (how the same idea held sway for about 2,000 years before being replaced with a better one). I also *really* like how the method of comparing hypotheses was described and demonstrated. Baby Zoe: Personal Attaché in the credits is a nice touch too...

[@christianjorquera]

pure gold, this channel needs to grow more!

[@eric3skywalker913]

Yeah criminally undersubscribed! Great content, great presentation!

[@StephaneBernardGuitar]

I think the explanation for the Stool is wrong (10:47). This is not the air pressure from below that allow her to lift the stool with the rubber sheet. There's still air pressure from above on the stool so without any additional upward force applied the stool will not move up. The real explanation is that the rubber is literally sticking to the stool because applying the rubber on the stool has removed all the air between the rubber and the stool and the air pressure from above and bellow allow the rubber to stick to the stool then allowing the stool to be lifted by the rubber handle.

[@Awminn]

It's difficult to explain force transfer without using math and vectors, which is why classrooms still rely on the good old whiteboard (or smartboard) to explain these things. The upwards motion of the instructors arm on the rubber disc creates a small vacuum between the stool and disc due to gravity pulling the stool downwards, which the air pressure pushing up on the stool counteracts, causing it to "stick" to the stool. However, there is no actual "sticking" force; it is literally air pressure pushing the disc against the wood, and pushing the stool upward against the disc, which is related to the volume of the vacuum. The materials used allow a vacuum to form when the disc is pulled upward, reducing the downwards force of air pressure on the stool itself. If there is no atomic bond (or in other words, no other force) between the rubber and the wood, what is it causing the stool to "stick"? Imagine what would happen if she used a much smaller suction cup, or one made of a stiffer rubber. A smaller vacuum would be created, thus less force from air pressure pushing upwards, and the stool would drop as the force from gravity pulling downwards would still be greater than the air pressure pushing up. Conceptually, this is hard to comprehend which is why it took so long to explain vacuums mathematically. Consider this: around the same time of Pascal, we also had Newton, whos third law explains rather well how suction and vacuums work, and Leibniz, whos integration methods gave us an easy way to quantify what was happening. Please understand that I'm trying to explain this from a second year sciences student. All this said, I think she did a great job explaining it without relying on having a script in front of her to read from, or a whiteboard to draw and write things out.

[@StephaneBernardGuitar]

@@Awminn : Sorry, I'm not convinced by your explanation. The vacuum is there even if the teacher is not pulling. It is there a soon as the teacher applies the rubber on the surface. Whatever the vacuum produced there would be no moving upward if the teacher was not applying an upward force to lift the stool. If no lifting was necessary you would see the stool going up like in levitation, that would be a wonderful magic trick don't you think ! Yes true there's an upward pressure from the air on the stool but it's not enough to make the stool go up. Only the lifting by the teacher makes it go up and the lifting is possible because the air pressure on the rubber is enough to make it "stick" to the stool while being lifted.

[@tuplaluusto]

@@StephaneBernardGuitar "The vacuum is there even if the teacher is not pulling." Why would there be an instant vacuum? When she is not pulling, the volume between of the rubber and the chair is about 0. So when she lifts up, the volume rises and by that the vacuum is created.

[@StephaneBernardGuitar]

@@tuplaluusto yes you're right. I just confused the rubber with a succion cup which by design needs no lifting to produce the vaccuum. Thanks.

[@DavidLindes]

@@StephaneBernardGuitar another way to think about it: when she's not lifting, the air is pushing the rubber disc down onto the stool. Only when she lifts the disc (a) does the vacuum form, and (b) does the disc stop pushing down on the stool. Between the two of those, the air below the stool can finally start pushing it up, because the net forces change.

[@iamise]

This person is a really good teacher. Really good demonstration with explanation.

[@timothyball3144]

As a mechanic, I see proof of this quite often, and in fact, rely on it for proper operation of many things. I had an hydraulic instructor tell us once that nothing can be pulled, only pushed.

[@oriza2]

Tell it to the slaves who pulled boats by a rope. :)

[@mauYair]

That's gold, I'm certainly going to use this in my Physics class. Thanks!

[@calvinlee1127]

i have been seeking for a experiment to prove air only push but never pull, seem common sense but some people still believe low pressure is what cause the lift of a plane, hard to prove until now, thankyou so much

[@hugs4drugs205]

Note : about feeling pressure, i do landscape work in central florida and we frequently have storms in the afternoons in certain parts of the summer, and ive become accustomed to feeling the lower pressure when a storm is about to arrive. Theres almost a 2 minute warning where the pressure suddenly drops and everything cools just a bit, followed by strong winds and then rain. Just an anecdote of "feeling" the air pressure

[@HandbrakeBiscuit]

I called my band in my university days Vacuum. We were pretty abhorrent whatever altitude we played at. Basically, we sucked more than was even possible by the laws of Natural Science.

[@HandbrakeBiscuit]

...and our gigs were really lifeless - just no atmosphere whatsoever...

[@andrewboktor1636]

Why did this channel die? Please continue. This is great content. I will subscribe regardless. I really hate seeing great creators like this stop making content.

[@annoyed707]

It could be that she got busy as a working mom? Just one possibility. Also, the resources for these videos may not have been continued. Who knows?

[@David167projects]

I remember the teacher and others saying that sucking is not a force to move liquid or gas. I remember saying that "suck" is just a single word to save us from describing the process that happened.

[@newdawnfoundation5237]

I hope she makes more videos, these are extremely well done and informative.

[@midnightantelopes]

Fantastic! Everyone should watch and learn about these foundational yet deeply unobvious principles.

[@ronidaffan5904]

Such a great video ! Thank you !

[@katacutie]

What an incredibly well put together video!

[@saidinesh5255]

very nice and well-explained thank you

[@carolinusTG]

Great video, not sure why it only crossed my page now, but definitely enjoyed it.

[@brotherfredrick]

This channel is awesome. Subscribed. Waiting for new uploads.

[@gautamkumarverma1736]

For every science students,this would be great video. Because it tends to fill and tends to visualisation. Thanks DR. for your efforts. Please upload more and more videos on fluid mechanics technologies which r used in or will be used in engineering.

[@salifti7534]

Best educational video ever. You should get golden buzzer. 🎉🎉🎉🎉

[@Dracopol]

Baby Zoe, Personal Attachée. LOL!

[@genevievemenz5906]

So bad ass. Such great work! Thank you!

[@allthe1]

This is so interesting and very relevant in my field of work! Pumps are simple machines yet so unruly when pushed to their limits.

[@williamgreene4834]

Speaking of pumps being pushed to their limits. The fuel pumps on SpaceX's Raptor engines are driven by a 75,000 shaft horsepower turbine. Also the pump outlet pressure is over 11,000 psi.

[@billwaterson9492]

Amazing production and presentation. This should be on tv.

[@magusesper616]

where do these spontaneous public physic lessons take place? thanks for the video duder.

[@bsv8055]

Good explanation by u mam.Please make more videos!! U have a good explanatory skills and u have done much effort for this. Truly Enjoyed 🙌

[@Scorpiove]

Your science videos are great. Hope you will continue with your channel in the future. :)

[@jaimeduncan6167]

She is great, I will love if they created more videos.

[@OldBrownDog]

Good one, hence submersible well pump. 👍

[@logically1028]

Love it. Thanks

[@whiskeytango9769]

I think the water segmentation is due to it's boiling under the near vacuum.

[@DavidLindes]

Just watched all 3 videos on this channel. Great stuff! I guess you're off with other priorities recently... I hope you'll return here eventually, though! Subscribed!

[@AdaManfaat]

Very well explained, Mam. Will you consider that water also vaporized at vacuum, which is also contribute the fact that you can't get 10meters height when you pull the water column up? With Pascal only theory, you should be able to create 10.3 meters column at sea level location, but you can never get it in room temperature, right?

[@muhammadm4582]

More upload please

[@aarrodri]

Your channel is amazing ! Please comeback and keep making videos

[@Argoon1981]

Love this videos of physics experiments, being shown on the street for the general public to see this, should be done more often to dispel many wrong assumptions and myths we all do and fall into. IMO knowledge of physics help us, why? Because of cases like the following, In 1999 in South Africa, a kid helped a entire village that was dying of hunger, caused by a severe drought, he read on his school library, a science/physics book how to create a wind electricity generator, and coupled with the fortunate luck of having access to the required but rudimentary components, he with the help of others, was able to use a old electric car water pump that he got from a old car dumping ground, to pull enough water from a well and irrigate the fields that way, today his small village, uses wind towers to even produce electricity for houses. This is a inspirational real story that should show us all how knowing, even basic physics, is very important.

[@PrestonK92]

That was brilliant.

[@wieslawkruczala3205]

Thank you for the video. The real story was a bit more complicated. The first to do the experiment was Gasparo Berti. Then Torricelli repeated it with mercury and said that we live in the ocean of air. Finally Pascal repeated the experiment on a mountain. Now it is called Torricelli's experiment.

[@EdE077]

Thank you!

[@VG-eb1kd]

02:19 I used to think that the fire will consume all of oxygen thus total pressure in glass will become almost 80% of atmospheric pressure, then the water rises inside the glass because atmospheric pressure is pushing down on the liquid outside the glass. This is also a part of reason right?

[@bob.bobman]

If the pressure pushing up on the stool is what is holding the rubber and stool together, if you lift it above 34ft would it separate?

[@korbensc7218]

Question: In the explanation of the rubber plate lifting the stool (10:49) only the pressure from below is mentioned, as lifting the stool. But isn't there still pressure from above, "pushing" the rubber plate down on the stool? I think these two forces, which press the chair and the rubber plate together, make it possible to lift the chair, because they press the two surfaces together so much that no air can get between them.

[@michaelraab5669]

As the rubber pad's handle is lifted, the air trapped beneath exerts less pressure on the chair top and pad bottom. By lifting the pad only, it could be said that the differential force of the air on the bottom-top of the chair is enough to counter the weight (down force) of the chair, thus causing it to "float." I think there is a breaking point related to the ability of the pad to resist deformation. A heavier chair (>⬇️) would require a greater force of air beneath it(⬆️) than the atmosphere can provide. Assuming you could still pull the pad up, the heavier chair would cause the pad to become more conical and allow atmosphere to leak into the space between.

[@benmcreynolds8581]

🧲🌡️📡🔆☢️🔌🔊🔋♻️🌐☯️⚛️ It's facinating to me that when we look around & we see all this complexity with-in the Universe. The complexity basically comes from: ~{"Differences"}~ That "factor" seems to be the key factor in keeping dynamic systems functioning. Just look at: *{High pressure/low pressure, hot/cold temperatures, different densities, viscosities, turbulent flow, static electric charges/discharges, +/- electromagnetism, different frequencies of photon's, different velocity/angular momentum, different amounts of energy/mass/vibrations. Different boundary layers between different regions such as: (Land/water/air/layers of the atmosphere/space/ the different regions in space with different particle density/background radiation, solar wind/membrane layers/bubble's/surface tension/cloud regions, nebula's/Galaxy's/Galaxy clusters/ Cosmic filaments/less dense regions of space compared to dense regions of space.) All of these things are basic differences but create a way for the dynamic engine with-in Nature to continue flowing and operating to create and convert energy.} Just Like How a battery 🔋 transfers + charges through a membrane layer to a - charged side. Like how regions of high/low temperature 🌡️ create winds. In water- add some factors and It creates ocean currents and flow. Then internally inside our planet it creates plate tectonics, planetary convection, geothermal activity, a magnetic field around our planet, to hold a atmosphere. The list goes on 🧲🌡️📡🔆☢️🔌🔊🔋♻️🌐☯️⚛️ The natural world around us is utterly facinating.

[@adarshmahajan223]

But even when the pump decreasing the pressure in the pipe less than the atmospheric pressure, why the water doesn't going up after 10.8 metres? Bc the pressure of the water inside the pipe which has reached to atmospheric pressure and even if it goes up a little bit it will come down to balance the pressure inside with the atmospheric pressure. Thank you so much for these videos.

[@Kenjiro5775]

There is no such thing as suction. It is always pushton.

[@saswatsarangi6669]

but but but i have a doubt we heard this height thing , so my friend did something (we discussed before that) that water should climb in a half filled bottle turned upside down, it's mouth submerged in water , but water stays at same height, the air inside the bottle can't be at the same pressure the air on top of container in which water is kept and bottle is submerged

[@75blackviking]

I work with a bunch of self-proclaimed scientists. This gal could teach them a thing or five and probably not even realize she did it. Great content, great presenter.

[@manishmpib]

So, to balance/equify pressure at the bottom all this stuff happening.. And pressure depends only on height therefore don't matter how wide the tube water always pushed by atmospheric pressure to a level 34 ft😇😀

[@manishmpib]

Also you depicted so brilliantly that in summer air got heavier😊(so that h2o level goes high 07:00 ) one heart for you ❤

[@allangibson8494]

Water vapour is significantly less dense than air - condensed water is more dense… water vapour at STP is 0.8kg/m3, air 1.27kg/m3.

[@mk1cortinatony395]

Why doesnt the air pressure push the rubber mat down with the same pressure onto the stool as when there was no mat?

[@parasmahajan09]

Could u please refer some books regarding pressure in fluids? Please!!

[@bryantnecessary7719]

So I’ve been plumbing for a long time now. I have experienced this before many times. What I always wondered, is if you keep pumping and taking the air out of the water with a pump, would you be left with hydrogen? Or would some of the gas sucked up by the pump be hydrogen as well? And if it’s not a closed system as shown here. If left on long enough would you run out of water or would air just move through the water to get to the pump?

[@philcook9967]

Air is composed of 20% oxygen and 80% nitrogen, there is no hydrogen.

[@bryantnecessary7719]

@@philcook9967 I was talking about the water separating. H2O. As in would a powerful enough vacuum separate water?

[@__Mr.White__]

very good stuff

[@MUHAMMADAKRAM-rt1lj]

really great

[@HookBeak_66]

I only had basic a understanding of physics & chemistry at school, science isn't a given, it's always open to further tests even amongst the finest academics minds. Our seat of learning should be a lifelong quest not just end when leaving formal education. Its all out there in the metaverse, you just need to know where to look.

[@sherpalou]

It isn't the vacuum, it's the pressure surrounding the vacuum

[@myeureka8974]

I have a question. What if we increase the the diameter of the tube at the source of the water at the bottom and then gradually decrease it as we go upwards? In this case can the water reach a greater heights?

[@Physics4Life]

Great question! The pressure of a fluid at the bottom of a tube is related only to the height of the fluid in that tube, not on its volume or the shape of the tube. So this maximum height cannot be surpassed in this way. This is related to the hydrostatic paradox, which you can learn more about in our other video: kzbin.info/www/bejne/bKvIeYqMis6LpcU

[@abhishekmamodiya1224]

how can you explain th e weight of here .......it is measurement due to the collision to the surfaces .....the extra pressure it is applying at bottom

[@matthewhopkins7042]

So does it suck? Or does it blow?

[@CuriousBrains]

Thank you so much! Now I'm cleared.. Actually I had a same doubt about vacuum, if vacuum has a tendency to suck, then why don't the outer space doesn't suck the air present in our Earth?

[@calvinlee1127]

because it suck from all direction so it cancel out, causing the earth to expand but gravity hold every things up (this explaination is from the perspective of the WRONG suction thery)

[@mepammomin]

What if your presumption as vacuum created in the tube is actually water in a form of gas that's why height varies with the outside temparature. What I mean is that due to the low pressure water evaporated at the height of 34ft

[@MrRoss-lr1ud]

At what height the chair will be released by suction ruber?

[@prestigelanguagecenter2371]

You’ve earned one more scientific follower

[@bluefox4902]

I pretty sure that the chair pressure from below is incorrect. The air pressure does not change direction because you lay out a piece of rubber. The air pressure is still the same 360 degrees around that partial vacuum, that is created by lifting up in the rubber. No, the rubber forms a seal, the pressure wants to get in because of the space created, but it can't, the pressure from all directions is holding the rubber in place. The greater the vacuum, the stronger the pressure that wants to get in, its self reinforceing.

[@gang_starr1001]

I was under the impression that the top of the column is the water boiling because of such a low pressure

[@pazzt4243]

Amazing

[@pluto9000]

So interesting 🤔

[@2010MewDeeK]

very nice

[@adnanansari9770]

Mam you've all the qualities which are required by all the students But the one quality which I want to appreciate that's you're so beautifull and cute mashaallah ❤️

[@MrLucidity]

Surely this cannot be University level stuff!? This is stuff i learnt in High School! I wasn't even in the 'smart class' Sheesh...

[@RamenOrwheeze]

You'd be surprised how many people think vacuums suck. Most flat earthers so there you go.

[@hugs4drugs205]

With puns like that as a thumbnail how could i not watch

[@gsilva220]

It's not vacuum that sucks, it's *_Delta-P_*

[@captainamericawhyso5917]

In Pascal's tube, the pressure at the bottom of the tube shouldn't it be Patm + ρgh ? Why is it only ρgh?

[@1marcelfilms]

Vacuum doesnt suck. pressure blows

[@philcook9967]

Water is a compound of two elements, hydrogen and oxygen, chemically bonded together. In order to break the bond and separate them, a form of energy, such as electrolysis, would be required. Any air dissolved in the water is a mixture of two gases, oxygen and nitrogen, and there is no chemical bond between them. If you use a vacuum pump (not a water pump), the dissolved air could be separated from the water, but there is no kind of pump that can separate the hydrogen and oxygen that make up the water.

[@manishmpib]

👍 congo for your baby

[@abhinav7221]

I was watching #verisatium contest videos And found this channel Love from india

[@nnamerz]

Me too 😀

[@philcook9967]

When the candle flame goes out and the water rises into the glass, the most common explanation is that the flame used up the oxygen causing a partial vacuum. In fact the oxygen is replaced by an equal volume of carbon dioxide. The real reason is that the flame heats the air causing it to expand and bubble out from under the glass. When the flame goes out, the remaining air cools and contracts causing a partial vacuum.

[@SteeveEfnet]

all interesting until the part where the "air is pushing the bench up" that is not correct.. the air pressure press down the edges of the rubber/suction cup and seals it down. Then your arm does the lifting, not the air below .

[@nnamerz]

That's exactly what I was thinking too. Unless there's something else we're missing here...

[@TheRhopsody]

So what happens if you lift the stool past 34ft?

[@joeshmoe7967]

Vacuum is just empty. This confounds flat earther's who think our atmosphere next to 'the vacuum of space' can't exist, as the vacuum of space would suck the atmosphere into space. Pascal's observations an laws easily explain the relationship of our atmosphere and space. Space is empty and no pressure, our atmosphere at the top is very low pressure. The differential is such that gravity easily holds our atmosphere in place. The is no giant sucking force in the vacuum of space. There is however, a giant sucking force inside the head's of flat earther's....

[@manishmpib]

Mam please explain that at a planet where there is no vacuum does can we able to pull up stool

[@Physics4Life]

Do you mean if there is no atmosphere? If there is no atmosphere then you would not be able to lift the stool with the rubber sheet, and you would not be able to drink out of a straw.

[@manishmpib]

@@Physics4Life yes mam you got the right no atmosphere no gravity no physics4life😀😉

[@manishmpib]

@@Physics4Life actually its too late for your response i passed my 12th now qith all doubts cleared. But thankyou for your response. But why you so inactive in such a booming platform with your extraordinary demanding capabilities. Make videos very frequent on these kind of Controversial and confusing concepts. I think you'll grow tremendously bcoz of your awesome communication skills and knowledge. 😊😊😊

[@MattH-wg7ou]

Vacuum pushes. No such thing as negative pressure. Only negative relative pressure.

[@The_Green_Man_OAP]

11:13 The rubber has a _cohesion_ with the stool due to _Van de Waals_ forces and this _traction_ increases due to changes in _pressure distribution._ ⤊ _---_ \▽/ ⇘ ↓ |⤊| ↓ ⇙ ⇘ __--- ---__ ⇙ →___/⤢ ⤡\___← The applied force on the handle & _gravitation_ of the stool plus the _cohesion_ causes _deformation_ to the rubber & a _restoring tension_ develops inside it, which (because of the cohesion) ends up pulling the stool up where there is contact, _due to traction._

[@gregorywarrenblunt5622]

So it all depends on how you define the word suck?

[@johnx9318]

A vacuum is described from the inside and high pressure is described from the outside. It seems that they are the same phenomenon but described from different perspectives.

[@80cardcolumn]

I agree. At 10:29 she says that sucking (creating a vacuum) alone does not move the liquid in a straw; sucking plus air pressure does. I feel this is just semantics.

[@theaqualibriumwatercompeti5886]

Great video, but it was Evangelista Torricelli who said that we live submerged under an ocean of air (and invented the barometer), not Galileo. A lecture on science should get the history right too!

[@specialrelativity8222]

please upload more❤❤

[@wowalamoiz9489]

There's a very simply test to see whether vacuum produces a pulling force or not. Simply stick a vacuum cleaner tube into a bowl full of sand. This will prevent air from being sucked in. If the vacuum creates a force, then the sand should move up the vacuum tube.

[@murrayspiffy2815]

She said everything but why - *the why is the electrons of the atom are programmed to create a unilateral distance from each other* (like people in a movie theater) and when a vacuum exists - the closest electrons rush to get elbow room from the neighboring electrons - and because they are so small - but powerful - the rush results in dragging the mass of the atom~molecule structure along with it - and the result is the water will move up the straw and into the mouth. Electrons create a domino effect because when one moves - they all end up moving because of the mandate of equilibrium.

[@3moirai]

Excellent video! Is there a follow up on how trees can overcome this limit of 34 ft in drawing water from their roots to their leaves that are higher than 34 ft?

[@stephenhill8790]

Two things cohesion and osmosis

[@bob.bobman]

So this means that at some at point above the Earth's surface it would be impossible to drink through a straw from an open container?

[@ThomasKundera]

For sure.

[@RonJohn63]

Nature abhors a vacuum, but it can only do so much about it.

[@texeiracorrea2708]

Water get sucked in she said it!

[@SoloLlamameDiego]

welp.... i came from a meme, this is gold

[@bigjd2k]

No, atmospheric pressure blows!!

[@OGTennyson]

Yh thinks kinda makes sense

[@WireWeHere]

Nature abhors a vacuum... beyond its original manufacturer's warranty period.

[@topherteardowns4679]

brilliant and beautiful. You're perfect

[@KaliFissure]

Vacuum mat not suck But everyone wants more room and will push their way in to get it