Venturi effect and Pitot tubes | Fluids | Physics | Khan Academy

David explains the Venturi effect and the role and function of Pitot tubes.

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[ippys]

Excellent explanation. Extremely useful for engineering as well.

[deutschlandmeinvaterland]

This is really cool. It's so counter-intuitive that a fluid passing through a smaller space has decreased pressure, but it's super easy to test with a hose.

[josephrossman]

"THAT'S GOTTA LOTTA PRESSURE" I lost it when he said that, it reminded me of Phill Swift in the flex seal commercials.

[nancything]

Did David Cross just teach me fluid dynamics?

[jinyeliu]

2:06 why do we care? well, i can answer that for you uhhh i wanna be a doctor!

[rubensneto]

Excellent explanation, thanks a lot. I'm studying about aircrafts systems and this video helped me a lot.

[vadkaa]

The thing is that you cant use Bernoulli's equation for Air!! It is not incompressible!!!!

[bnl]

But how can we use Bernoulli's equation on air if air is compressible? Density of air can change

[thefenerbahcesk]

Any brothers here from that mcat question about the venturi mask?

[Supernova-]

why is the height ignored? there's such a big difference :/

[brandonblair]

First year aviation student....teacher today was explaining carburetor icing and when she got to the point where she said that the restricted portion of travel has less pressure that the large volume behind it, my brain checked out. This didn't make any sense to me on a common sense level. This video explains whats actually going on very well. Thanks

[FirstDagger]

5:40 But isn't air compressible?
Edit: Nevermind, seems that for speeds below Mach 0.3 air is treated as an in-compressible fluid.

[jimmaskell]

Thank you so much! Hard to find videos like this that actually interesting!

[enbinzheng-line]

Will the air in the upward hole on the pitot tube not be sucked out? Because air has viscosity. The air flowing horizontally carries away the air inside the horizontal hole due to its viscosity.

[GenericUsername]

Hey! I'm studying to become a pilot and struggled to understand this now I know🙃 thanks

[Observer]

This is very disappointing to hear from the Kahn Academy. The reduced pressure is NOT "due to the equation".!!.
The in crease in speed (acceleration) is DUE TO THE PRESSURE GRADIENT!

[marcrogue]

I find amusing when people teach and use statements such as this happens due to the Bernoulli equations or such natural process obeys such equation, utter nonsense. Thing don’t follow equations equations describe what is happening. But if you said the process is obeying the underlying physics that would be a better answer

[edward]

In the second example, wouldn't the density at point 2 be larger than that at point 1 as the presure is larger and air is compressible. Thanks.

[HolyRamanRajya]

Taking the analogy of conventional electricity in wire, is low pressure the cause or the effect of high velocity here?

[physicsconceptsbytusharkha]

In pitot tube how the velocity of the particle in contact with the wall becomes zero. Initially it had some velocity. So in a long run the point at wall will be accumulated with large number of such zero velocity particles. How do u pls explain this.