Is Sucking the Opposite of Blowing? The Reverse Sprinkler Problem 

Hi

The Action Lab about the mouth fan, shouldn’t sucking force the blades outwards? And also, does a regular fan spin faster in a vacuum?

Yup...thnks for the explanation..it now quite makes sense..:) (actually i was also kind of thinking that after the comment... so thnks for confirming)

And just one thing.. i think the change in direction of air flow with in the straw will always push the straw a bit up and right diagonal direction(which by simple vector addition rules turns out to be the same for sucking and blowing....) right? plz reply..

In regards to findmens reverse sprinkler affect when the inventor Viktor schauberger ended up making a frictionless pipe, *with that pipe is it the same or different*

don't worry, same

Definitely not

I did to

On meee😂😂😂😂

no

What happend to the other 2%, it got covid?

@@jivan9649 brain rot

69%

@@jivan9649 brain rot

What? No way!

Daniela Valli I saw the title and was like holy fuck I have to read the comments

Yup. Had to read the comments fosho

That's what i was thinking and then i went straight to the comments

@@JustinWolffPhotography ...

Lenny Face - people have dirty minds and think of sexual things to do with blowing and sucking 😂

I didnt get it plzz explain

Entropy++

@@devendravyas7986 10:30

So you did an experiment yourself and was able to ignore your observations for 40 years not knowing the reasoning behind them ? 😕 I wish could stay satisfied as easily as you. Whenever I discover a seemingly simple phenomenon that I can't explain, I'm paralysed until I'm able to. 😂

@@sunilsoni3310 When you"re 13 the last thing you want to know is why you can't breath underwater with a garden hose. Especially when there were hot girls laying out by the pool. But it does make me wonder what you were doing at 13?

I was in my 20s until someone explained the difference in technique. Suck > blow

@@saltykraken9471 r/whoosh he meant ΡσΓη

@@coolxg4357 incel

Yeah, I always wondered where/why they came up with the word "blow" to describe the act of sucking.

finally a serious comment, thank you that was a nice kind of summary of the whole thing !

Sorry (since this is the only serious comment I find, I'll follow up..) I was under the conviction that the air would create a force as it enters (or changes) atmosphere.. as it comes out the straw, in the case.. therefore, this force would create an oposite reactive force pushing in the opposite direction, from the end of the straw... therefore, if the end of the straw is not pointing directly oposite to the mouth (or entering point or starting point.. I'm trying to keep the words under control here..) then the force would be transferred through the straw that will bend as it flexible.. in the oposite direction of the air exits.. back.. therefore, if a series of straws are aligned on a spinning gadget, and the muzzles pointing in the same direction in any other that a direct opposite to the direction of entrance, then the system will spin.. pushed by the air exhaling from the orifices.. the problem I have is that if the propelling force is generated in the bending point, this force could be easily neutralised by just "zigzagging" the straw... which would suggest that if a fire-hose would generate such strong push at the muzzle, all you have to do is, well, zigzag the hose.. As I've operated one of this monsters myself, through training exercises.. I think that this theory is very easily comprobable, and most people will agree that other than the weight of the hose (itself plus the water) the hose will present no significant challenge.. beyond any residual transferred force coming back from the muzzle.. that, to be said on the "why the straws kick back" when it's blown upon and it does not move when is suck upon.. since the force generated by the expelling of air (in to the mouth, or whatever) will be very easily cancelled by the sucking action of the lips, and consistent force to pressure it in place.. if you don't do this, you will just suck the whole straw in.. so, to resume, there's no kick-back from the suction action, as the machinery in place to generate the suction will forcefully hold the straw, hose or whatever in place.. referring to the to opposite forces generated in the action sucking vs blowing.. I thought it would be self explanatory, but your (Dr Action Lab) explanation kinda contradict itself.. you said that the same force is generated when blowing and sucking.. which is not what I understand from a biological point of view.. the lungs are more specifically qualified for blowing (since there would be much more muscular mass involved in this) than sucking, that can only be attained by contracting the diaphragm.. and not much more aid from the body... plus the reshaping of the lips, would as well increment the force.. to the area the sucking is subtracting from, there a whole lot of right on that.. my issue was on the machine utilised.. so, is you use a vacuum cleaner for the action.. or a pressure pump... the result would be much more dramatic (as many people fooling around with them toys have proven.. ) than just trying a fan or an extractor pump.. nevermind the lungs.. on this note, we have done an experiment placing a fan on a hose (big enough..) both ways.. and the sucking action, is nowhere near as espectacular as a pressure pump, does give some credit to the area affected by the action.. a very interesting and visual experiment to demonstrate this is to place a fan in a space inundated by haze or smoke.. quite visual.. anyway, thank you for keep our little minds in constant movement!! and a a shared pain on the "lightness" of most replies to this post. Thank you again. Javier and Logan.

Yes. But if you need way more energy to have a similar effect - it's not the opposite but a similar force, or?

At 9:30 he explains that you could never match the force of sucking with the force of blowing if the force of blowing is more than 1 atmosphere. With blowing, you could build up however much pressure you want (if the container doesnt break) but with sucking, the absolute minimum you could get is 0 atmospheres which is only a pressure difference of 1 atmosphere (the pressure outside the container is 1 atmosphere and inside the container is 0 therefore 1-0=1).

Underrated

@@nikosucksatskating criminally so 🤣

What answer did he gave?

Who is that

@@shruthisrikumar5907 my plumber

Same thoughts

@Shane ...You are correct to a great extent, but your explanation needs a little fine tuning as follows. There are two components to the momentum change vector in both cases. In blowing, to change the direction of flow of air from downwards to forwards, there are two resultant components of reaction force. One is in horizontal forward direction which creates the backwards push at the elbow joint and the other is in downward push which just creates tension in the walls of the longer arm of the straw. This pull if excessive will pull the straw out of the person's mouth. The air accelerates all the way as it flows out of the straw with its maximum velocity at the point of exit at the short end of the straw which is not very far away from the elbow. So at the elbow the velocity is high and therefore the change in momentum at the elbow bend is high resulting in a large backward pusing reaction force. Hence the straw moves backwards substantially. Similarly in sucking, there are two components of reaction forces as the air moves inwards and upwards at the elbow. The component which pulls the air upwards again creates a tension force in the wall of the larger arm of the straw as before and the horizontal component once again results in a backwards push on the elbow. But this backwards push is insufficient as the velocity of the sucked air at the elbow is much less than in the blowing case. The air has just enterd the straw at near zero velocity and is accelerating inwards horizontally when it encounters the bend and starts accellerating upwards at a significantly lower velocity. Hence there is no visible backwards movement of the straw in this case. It is all about the velocity of the air. The velocity of air in blowing is far more than the velocity of air flow in sucking. Humans can create lots of pressure differentials while blowing out but much less pressure differential while sucking in. If this experiment were conducted using a straw with both arms of same length and by using pressure and vacuum pumps providing the same amount of pressure differentials, the results would have been identical. In both cases the straw would bend backwards equally. However, the straw would have to be structurally reinforced with hoops to prevent it from crushing collapse when subjected to low pressure conditions of sucking.

Levi Ackerman nope😂

Don't worry i did as well

its a great video with a great title, what can you say

Eren

Don't worry, theres always a bunch of men of culture on YT

Fine Science what does he work as I’m guessing a physicist or something

goodest grammar

@@yousif308 i once heard he worked as a chemical engineer?

@@yousif308 A chemical engineer, it's in his channel description and he's mentioned it several times in his videos before.

@@smaker1377 lol 🤣🤣

*grabs popcorn*

Yoy

Too late, found one before this comment ( ͡° ͜ʖ ͡°)

Let's see how long until the comments are disabled lmao

Cream the fennec fox The thumbail says otherwise ¯\_(ツ)_/¯

ME

Me

Me. I remember some cyanide in apple experiments and aero gel and much more

Yes! It has grown a lot!

while he did dabble with a hydraulic press he actually used to primarily be a vacuum chamber channel

if that's not true then he'd blow his job

i DoNt GeT iT?

DounutLetsPlay no u

Fatima hassan You just ruined this comment

but amgil is

what's sugma?

@@charlottestewart1851 sugma ballz

What about sugandoze tho

Soguy is the opposite of ligma

Mechanical lens is a cool analogy

"erection can carry out for a very long distance"

According to Google, you use several parts of your brain when doing physics.

Apparently it didn’t touch the part of your brain that knows how to spell physics

@@avery3833 sorry🙃

@@avery3833 and apparently your brain part which is responsible for reading is on holiday😉

KillerFinnish WR he edited it... apparently your attention paying skills have gone off the deep end

Me either, and I have a dirty mind.

I immediately did 🌚

David Prodigy You're not alone buddy. I really need help

Or you might even attach the shopvac

neg pressure in the fins would probably cause it to collapse before you got enough focused force to actually make it turn. it has to do with force distribution. suck is equal to blow physically but distribution of that force "changes" the effect it has like the difference between a 1w laser and a 1w flood light. the laser is the blow the flood light is the suck. equal force. difference "effect" because of force distribution.

You remember me ?

Oh finally someone who took the video title not in a lenny face way

I thought it was hilarious

Best part of the video🤣

I require proof.

I called chief and he said this aint it if theres no proof

I should have been more clear. I require proof in the form of a demonstration on me, for science purposes of course.

Probably the only thing you're good at ...

What boyfriend?

I would assume so. Sucking is blowing in reverse.

My thoughts. I thought it would turn the same way as with blowing. Well I'm no physicist.

I'm a little late. But was exactly what I thought... By the explanation he gave us from blowing (the air changes its direction, and move the straw on the opposite direction) and that ''sucking and blowing are the same in a confined space'', sucking would force the straw downwards. The force should be weaker but should exist. I'm from Brazil, so apologise for any grammar mistakes

@@meunomeerique Yea Yea I had the same Idea LoL. How come the straw goes to the way he supposed it would go to?!

I need Help. Where are the Physicists؟

2:00

There were so many chances to so something else

( ͡° ͜ʖ ͡°)

@@dacoconutnut9503 《●.●》

@@dacoconutnut9503, didn't icu before?

@@lemvarbsdass1065 probably

( ͡° ͜ʖ ͡°)

I totaly agree. I was thinking the same.

I agree too!

I just wrote my own science rant on this. glad to see im not the only one who had an issue with the straw argument

agreed, if the air is going up the straw should it not be pushing downwards against the side of the straw, since that would be the side it has to push against to travel up, which should create some force downwards. be an interesting theory to test

The reason I have a problem with both theories is the fact that when you suck in air no matter what direction the air is coming from it would be pulled into the object no matter what direction water is coming from it would be pulled into the object the recoil shouldn't be a factor mostly because unless you are doing this is let's just say zero gravity the argument is really invalid because your not accounting for weight or mph of the blowing or sucking motion never the less air and water are too different things water has more mass than air air is lighter than water so in that case you cannot put those two as a comparison water has friction so does air so goes the law of conservation of energy no energy can be created or the destroyed so it must be distributed and Newton law every action had and equal and opposite reaction and whether you say recoil is a reaction it's still goes through the rabbit hole of friction and energy conservation my beliefs of this theory is kinda middled but that's science and btw nice vid

It gave the best suc.

Noffy Welp you just ruined the comment

yes

That is true.

biscuitsalive thanks

i thought the exact same thing.. how did he not think about it

Same lmao

Just scrolling through comment section liking your comment. i'm 50th pog

I wonder why Mr anime profile picture

@@gustopher6500 Do tell us what it's like? Tell us how it feels when a woman licks your frenulum, and looks you in the eye expectantly, as your throbbing member eases into conclusion, and she wraps her tongue firmly across your tip, bringing heaven to the fore, leaving you unattached to anything resembling sanity, as you stare back into her eyes, and witness that final moment, where you caress her neck with the razor and watch the red, flowing movement of her life, suddenly run fro.. wait, wrong fantasy... shit.. Where you watch her body writhe in ecstasy, taking e... oh fuck it, still stuck on the first one now.. damn you friggen incels... :/

@@parishna4882 Do tell us mr edgy profile picture

@@parishna4882 i feel like i would smack you if i saw you in real life, regardless of your age.

@@parishna4882 jeez imagine being this mad

Well that's because she was practising it on me for many years

@@Pizaerable that's rude

Well there is some physics behind blowing and suckling

Charles Darwin how? You sound like you have a vagina

If she existed.

ikr 😂

*B L O W W*

What's a non ex mate? You mean "... no ex, mate!" ?

No u

Why not U? it's a cool later it makes you spell Urethra.

Ha. Ha... Ha. Don't become a comedian.

Plot twist: im your girlfriend HAHAHAHA

Plot twist: Im your girlfriend

plot twist: he was actually talking to his mom

Jonathan Holz yeah I'm imagining the force will be pulling the straw away from his lips. It doesn't really correlate well to his example with the vacuum since the confines of the straw don't allow air to be pulled from different angles, as in the fan diagram. The force is applied pulling the straw away from his mouth. The way to test this would be to apply sensors to test the stress pulling the blades from the center.

Try it with a double-elbow straw! (Doesn't happen.)

Customers? *FBI wants to know your location.* 🤣

Lol

2018*

He doesn't have frictionless lips. The straw is basically a lever, with the fulcrum being where he's holding it in his mouth.

thank you lol

Shreenabh Agrawal Thank you, same to you.

Its not that random than u think

Thanks you too random person

Its not daytime but ok...

Don't ask your mom.. seeing as you're alive. Ahhahaha see what I did there? if she'd swallowed, you'd not be.. get it? it's obvious. Why don't you get it?

Hi!

Your first...... 🏁🏆

You are first

*BEWARE!!* *SEXUAL JOKES INCOMING!!*

yaiii

Leonard Landor that is the weirdest lenny i have ever seen why are there ears? ( ͡° ͜ʖ ͡°)

That's my line.

Oouhh see...

Thats correct

Corect but we will never know witch one is corectt

someone called "kevin matz" explained this in the comment section pretty therally "The concept itself of "sucking" and "blowing" are indeed opposites(as proven at 8:35). It's just what happens to the air/water/whatever that reacts differently from being sucked vs blown. Similar to shooting a bullet out of the barrel of a gun, the force is concentrated and pinpointed into a particular direction. When being sucked, however, the air is sitting stagnant in space all around the room before being drawn from all different directions into whatever source the sucking is coming from. This doesn't necessarily mean they aren't opposites, it just takes a heck of a lot more sucking force to match the same amount of force that blowing air could crate due to the fact that the air isn't coming from a particular confined location. Think about walking in front of a jet engine, people can get sucked into those pretty easily I'd say. "

(Yes, I'm aware this is a 2 year old comment) Different doesn't mean opposite: A train and a brick are different. Is a brick the opposite of a train?

Lol

I like this video. It answers a question that a friend and I had months ago about air blown out of your mouth vs air sucked into your mouth and which one is more powerful.

Are You real?

yes i am

@@leogocong6793 pewdipie fan?

yes

I think he did

Succ-ing vs Blowing