Balloon in a funnel.... Bernoulli's principle fun experiment

Here is a fun way of scaling up the classic experiment of the ball in the funnel. It's been a staple of science classrooms and as a child's toy for years demonstrating Bernoulli's principle and the Coanda effect. Can you explain how it works?

In upcoming videos I will show additional demonstrations and an explanation.

[fendergrab]

Bruce making science look like magic to get kids interested is fantastic!

[GrandadIsAnOldMan]

Merry Christmas and a Happy New Year.🎅❄🎄☃⛄ And that was a brilliant demonstration 😁

[Bryan_Kay]

The atmosphere is doing the lifting. Great demonstration 👍

[shazam]

Coanda effect has a lot to do with it as well. If it was a cylinder, it would fall. Tape some small feathers to the sides and bottom of the balloon to see the air flow!

[Wrackey]

I always wonder if this demonstration is "purely" bernouli, or also the Coandă effect. Does it work with a shape that isn't a sphere, but does fit the cone nicely?

[f.a.]

High airflow/pressure in the Narrow section between the balloon and the funnel create a suction effect, i'm not 100% sure why it happens, but I know that is where the magic happens, my best guess is since the air molecules are going faster in One Direction at that point, like laminar flow, means that it is pushing less on the balloon, so the atmosphere is pushing harder on the balloon everywhere else, generating the suction effect

[Chuck-wv]

Negative pressure in the cone from air flowing around the balloon?

[Totaro]

The air dryer is creating a low pressure area anove the ballon. The high pressure around and below the balloon pushes the balloon into the low pressure area.
Like airplane wing. The fast air above creates a low pressure area. Thus, the higher pressure area below gives lift

[kornelijekovac]

The suction from the machine is lifting balloon?

[stonelion]

I would assume it would be because of high pressure in the funnel compared to low pressure outside of it

[Techncian]

the low pressure caused by high speed airflow.

[earl_globz]

Is it the air going around the balloon? As well as hot air?

[zebfischer]

I was aware that the principal was about the relativity of velocity vs pressure but couldnt put two and two together without a little help from the comment section.

[grogu]

The diffuser created an area of low pressure since the flow of air expands despite slowing down in the large cone. Since the pressure decreased in the cone, the atmospheric pressure, which is relatively higher than in the cone, pushes up into the balloon. This force imbalance creates “suction” that forces the balloon into the cone.

[thehiddenyogi]

Well, because I'm a dumbass, I wouldn't have predicted it. But because I saw it and asked to explain it, I know the answer: the moving air has lower pressure than the still air. The hair dryer is causing 'lift.' Also, maybe the air in the balloon is heated like a hot-air balloon and is more buoyant than the surrounding air?