Bernoulli's Principle Demo: Levitated Balls

This is a demonstration of the role of Bernoulli's principle in stabilizing a ball held up by a vertical stream of air.
This demonstration was created at Utah State University by Professor Boyd F. Edwards, assisted by James Coburn (demonstration specialist), David Evans (videography), and Rebecca Whitney (closed captions), with support from Jan Sojka, Physics Department Head, and Robert Wagner, Executive Vice Provost and Dean of Academic and Instructional Services.

[@michaelornelas2868]

The entire Utah State University team that put this on gets an A+ 👏

[@student4567]

3:30 and that is a true teacher

[@rajushukla7003]

Absolutely great experiment

[@wypy817]

After watching tons of lectures I finally understand

[@Observ45er]

Nope. At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@helixjee1851]

Thanx A lot sir! Your demonstrations literally helping me in understanding concepts. 🔥🙏

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@user-rm2qj2jh4l]

Thank you for this video! I've been so curious about this!

[@rayazoe9067]

thank you! I totally learned it. you're the best👍

[@alphaace-pubgmobile9917]

If i had a teacher like you in my school days, I would have worked in nasa🤩

[@adda8043]

Could this be the same phenomenon as the suspension of the rota-meter; flow measurement instrument?

[@amirridhwan8335]

Omg that was dope

[@scottalv9683]

Could Bernoulli's principle apply to surgical mask?

[@jhanolaer8286]

what is the cause that balloon is bouncing in the air?

[@hopehenderson4937]

Does anyone know where I can obtain one of the demonstration devices that he uses at the beginning of the video. It looks like a children's toy.

[@aryawarty3643]

OH MY GOD. THIS IS SO COOL

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@aryawarty3643]

@@Observ45er hey man thankyou v much! I'll check it out

[@noel5544]

Tanx sir

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@martinc6204]

Hello, video very ineresanting!... Can this also be explained by effect's Coanda?

[@patricksachs7570]

Should be a mix out of Bernoulli-, Coanda- and Magnus-Effekt

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@magnifiedmicrons]

Outstanding sir 👍👍

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@magnifiedmicrons]

@@Observ45er I am extremely thankful to you for your observation. Thanks

[@Observ45er]

@@magnifiedmicrons You're welcome. This has bugged the heck out of me since taking responsibility for a pretty sophisticated full-cockpit B737 flight simulator. Knowing I'd be asked many questions, I looked into flight ( I heard the equal transit story in early pilot training long ago), and saw so many explanations that made no sense at all for physics, then so many that are flat wrong. I even contacted a few known experts and talked many times with my aeronautical engineer son. I'm an experienced electrical engineer.

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@marcochimio]

This was the comment that I was looking for. I suspected there was a problem, but I didn't know enough details to spell it out so well. Thank you.

[@Observ45er]

@@marcochimio At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@FluidMatters]

@@Observ45er These two effects are not mutually exclusive. The Bernoulli equations still applies here and is useful for teaching purposes. In fact, some textbooks (e.g. Young et al.) include the flow curvature effect on local pressure when discussing the Bernoulli equation.

[@Observ45er]

@@FluidMatters You're not refuting what I said. Bernoulli's Equation gives no cause and effect understanding, it only allows calculating values. I make no claim that Bernoulli's Equation is incorrect in calculating values when applied correctly. . I explained cause and effect. . Saying two things are ""not mutually exclusive" isn't explaining what you think I posted is incorrect. . What are the 'two things'? . Saying that things are "useful for teaching purposes" does not refute anything I posted and I won't dispute that. .. It is a measurable fact that the air out of any blower is at atmospheric [static] pressure, not below it. The energy accounting for its dynamic pressure was added by the blower'.

[@FluidMatters]

@@Observ45er Sorry, I can't teach you the fine points of fluid dynamics in the comments to a video.

[@hevenko]

Why does it start spinning?

[@Observ45er]

The effect of viscosity is like friction. The water "drags* the surface along with it. .. AND... 'At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@rudrakshlanjewar9637]

Hello Sir

[@ahmednashat2164]

how can i calculate the angle that makes the ball fail ?

[@physicsdemos]

That's a great question. You'll need the fluid (Navier-Stokes) equations for that, and they are not covered at this level. I've not done the calculation, but it's an interesting one!

[@ahmednashat2164]

@@physicsdemos can u help with it ?

[@boydedwards5475]

@@ahmednashat2164 I'm not interested in doing the calculation, but I imagine that it's already been done by someone.

[@javieranglada83]

As a rule of thumb, don’t go past 45° on any direction and you should be good

[@Dr_Asma_physio]

Nice....

[@GZA036]

More viscosity than Bernoulli

[@swatkhan1801]

Thanks sir from Pakistan ❤️

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@aryawarty3643]

And i can't believe i understood

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@Observ45er]

The common misconception is that any moving air, such as from a hair dryer, leaf blower or your mouth, has a lower static pressure than the stationary air around it. This is not true and comes from a misreading of Bernoulli’s Principle and misunderstanding of how to apply it. There are several demonstrations that are misinterpreted to show the static pressure is lower. The moving stream of air from one of these is at the very same static, atmospheric pressure as the still air around it. It is NOT lower. Here is the correct explanation. This moving air has MORE total energy than the still air around it, not the same amount. This additional energy was added by the blower. The Total energy is the potential energy of the atmospheric pressure plus the kinetic energy of its motion or momentum. Each of these ‘blowers’ adds energy to the air in the form of static pressure. This internal pressure is higher than the atmospheric pressure outside it. For example, muscles move the diaphragm to squeeze the lungs. This increases pressure in the lungs. This internal pressure pushes more on the air than the pressure outside A pressure difference between two locations is called a Pressure Gradient. This reflects the idea that the pressure changes gradually between the two locations. Because the internal pressure pushes more on the air, there is a net force toward the lower pressure outside the blower. The air is free to move and is accelerated toward the lower pressure. This is Newton’s Laws in fluids. Air has mass. A Pressure Gradient provides a net force. Mass is accelerated away from the higher force, toward the lower force and gains speed in this case. This happens at the outlet of the blower and we have the stream of air starting internally at the higher pressure and accelerating to atmospheric pressure. That’s it. For those watching the conservation of energy rules, the TOTAL energy of air INSIDE the blower is the same as the TOTAL energy of the stream OUTSIDE the blower. The trip from inside to outside has no energy changes in that air. We see that inside the lungs, all the air has nothing but potential energy in the form of static pressure and no motion with kinetic energy - no dynamic pressure. All the energy in the lungs is in the potential energy of static pressure. The air gains speed (acceleration) as it exits, thus changing the extra potential energy of pressure into kinetic energy of the moving momentum of the air’s mass.

[@InvincibleAarush]

It looks like CGI 😂

[@garievolutionsoccer3218]

I can understand it when i am 9... and now, i am graber: lol>

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@garievolutionsoccer3218]

@@Observ45er Thanks!!!

[@angel_ia]

Universal Acceleration. #FlatEarth

[@yovwi]

Angel IA what

[@Morbing_Time]

where is the energy coming from

[@angel_ia]

@@Morbing_Time The universe is a huge spaceship. There must be technology / engine to make it speed up through huge huge smoke medium.

[@Bhavani342]

Tired of seeing so many videos ☹️

[@canadean84]

You're on KZbin. Books are what you're looking for if you're tired of videos.

[@adda8043]

Could this be the same phenomenon as the suspension of the rota-meter; flow measurement instrument?

[@sukumarsawant]

yes bro rota meter is already inc;uded as application of bernouli

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* --> : "If you have a high velocity, a high airspeed, then you nave a low pressure."

[@mrboombastic_69420]

Who are you, ?who is soo wise in the ways of science?

[@Observ45er]

@@mrboombastic_69420 Somebody who paid attention since first grade and contributed professionally to bring modern conveniences to you based on the sciences, such as the cell phone. Then, upon taking an interest for this because I took responsibility for a full cockpit flight simulator and would be answering questions, studied and consulted with a few noted experts and teachers actually working in this field. Knowledge shouldn't be intimidating. Don't you have a specialty, or profession you excel in and, perhaps, help others to learn?

[@mayacobben5706]

Thank you so much for the information and links, that with water stream is so cool! Inspired me to write my extended essay about this topic (I'm in the International Baccalaureate)

[@Observ45er]

@@mayacobben5706 You are welcome. It is so frustrating to see so many people giving incorrect information on this subject, especially at the university level.

[@Potatomatoo]

Thank you i was very confused not it's much clearer

[@Observ45er]

At 1:55; Another video with *the most common misconception in fluids.* .. The centering is caused by the *acceleration* of the curved flow and is called the Coanda Effect, NOT Bernoulli's Principle. .. The statement at time 1:55 is *Incorrect* : "If you have a high velocity, a high airspeed, then you nave a low pressure." *

[@lyn-lyn7173]

Then, what simple demonstration can we use to correctly show Bernoulli's Principle?

[@Observ45er]

@@lyn-lyn7173 *That little blower he holds!* The decrease in pressure is from the relatively higher pressure inside it to the relatively lower atmospheric pressure above it. The stationary air is Accelerated up to speed in the stream and the pressure decreases *down to* atmospheric pressure. . *The increase in speed is Accompanied by the decrease in Pressure* . Everybody misses that!! ,' Your diaphragm squeezes your lungs to increase the pressure in them, thus pushing (Accelerating) the air out into the lower atmospheric pressure and we call that 'blowing'.

[@lyn-lyn7173]

@@Observ45er Wow, thank you very much. You're very passionate about this huh? I actually asked you on a different video using a diff. account about Bernoulli's principle as I had a presentation the next day and I was still confused. You really helped me out a lot. And now, we were asked to show demonstrations, that's why I'm back haha. Thank you very much for your help!