Volume flow rate and equation of continuity | Fluids | Physics | Khan Academy
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- Опубликовано: 22 июл 2024
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Sal introduces the notion of moving fluids and laminar flow. Then he uses the incompressibility of a liquid to show that the volume flow rate (flux) must remain constant. Sal then derives the equation of continuity in terms of the area and speed. . Created by Sal Khan.
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You definitely deserver more subs than any youtuber because you give content that is actually educating. I have learned so much from you that I can consider you as my teacher/professor for all major subjects
Just had the 'ah-ha' moment. Happy.
I know right, this is best feeling
great video. I know he saw it was flux for volume over time but it is also known as flowrate which is self explanatory but used in the book as well.
He's got clear talent in tutoring bro! Hats offf......... :D
haha we think the same! the first time i thought off when i heard of flux is the flux capacitor!
way better and shorter then the videos of the technion.
Finally figured it out after years
what is volume flow rate of air passing through the ring perpendicularly or by making other angle(45 deg, 30 deg)?
Quarantine, Khan Academy is my new teacher
the first video with 44 likes and NO DISLIKES!
AMAZED! :O
This is a great video, but I want to point something out @8:17. I think Sal is confusing volumetric flux with volumetric flow rate: volumetric flow rate is the rate of volume flow per unit time (e.g. L/sec), while volumetric flux is the volumetric flow rate per unit area (e.g. (L/sec)/square meter). This is important to note, because they're not the same thing, and I noticed something was strange beginning with a previous video (Bernouli's equation part 4) when the units of flux provided at the end of the calculation didn't match the units I came up with; I performed dimensional analysis during the calculation, while the units were omitted in the video (in all fairness, for simplicity and the sake of time). Anyway, great video. Please correct me if I'm wrong. Thanks
Thank you!
hi khan, thank you very much for this video. it was understood. however, my challenge is that, your analysis is based on fluid. how about if the material is granular in nature. like fish feed or pellet. i am currently doing a project that involve the automatic distribution of fish feed in a pond. Issues such as ratholling, bridging sometimes occurs. in my design, the fish feed is in a cylindrical container which has only one exit. i want to analyse the flow of the fish feed as it flow through the exit. i want to know if i put 5kg of the fish feed how long will it take to empty through an opening of say 5cm x 10cm. will the equation for fluid be applicable for these soft granular material. please i need this help. thanks
Thanks for the video ! But ı have a question hope that this gets answered: The reason why we were able to use same amount of time (t) for the left and right side, is because the pipe was full at the first time ?? so lets say 10 cm3 water that we put has to come out at the end at the SAME TİME because the pipe was full ?
The time for water to flow through an Ostwald pipette at 20°C was 297.3 sec. The density of water at 20°C is 0.9982 and the density of a sam- ple of olive oil is 0.910 g/mL. The viscosity of water at 20°C is 1.002 cp and the viscosity of the sample of olive oil is 84.0 cp. How long will it take for the olive oil to flow through the Ostwald pipette at 20°C?
@farzero They're not actually incompressible... but it's a good approximation for most liquids we'll ever deal with.
Thank you
Just love your videos!!
Happy anniversary to this video
This video isn't loading for me
yeah, it's viscosity is so high it looks like a solid. I guess that's how glass is a solid AND a liquid: an amorphus solid
aaaaah velocity and volume are both represented by v. SO CONFUSING.
But you explain it very well. Thanks (:
How could be the same time 't' for output fluid cylinder to flow out...
ı was wondering the same thing ı guess it is bc the pipe was full. ı've asked it up again hope it gets answered
I'm at a paradox here. I've heard a theory of a possibility of compressed liquid core gas giants that emit no thermal energy. Can open space be so cold as to freeze liquids, compressing them as their gravity increases? If so, what prevents thermal generation? I could never understand that part.
Thank you!!!
ohh good video
Actually fluids are compressible. Just not easily so. When water is heated and cooled, its volume changes. Air conditioners use a similar principle to heat and cool air by changing the volume of a liquid.
@92310CAMILLE where v is the velocity and a is area..
I think I'm gonna cry.
Thank You so much! :')
@ElaM1NaTo because of area,remember the flow rate formula...V1A1=V2A2
the water need not to flow through its full area in [Area(out)] generally not such is the case in the real life
The opposite of laminar is turbulent? Therefore surely syrup is super laminar? It has minimal turbulence coming out?
Does this apply to gases such as air?
what happends to the viscosity of water when pressure changes
Yay helpfull👍
how to convert volumetric flow to mass flow???
tushar gharatkar times the density
I see that you are calling for donations. Consider it done. Also, happy to contribute material, should the need arise. Physics/math/programming are all in my wheel house.
Glass isn't a liquid sal. It is a common misconception. Check out 60 symbols on it.
He didn't said liquid, he said fluid.
I wonder what would happen if you compressed a liquid extremely hard but the material around the water could not break.
I guess it would turn into a solid, like lukewarm ice or something.
Laurelindo water gets compressed under very very high pressure...though its neglegible as compared to the amount of pressure applied
glass is classified as an amorphus solid.
Not loading for me either.
Nevermind. I clicked a few seconds into the video and it started working
DarkMedicine This worked for me too.
Very informative videos, however in 2023 it is very difficult to watch an instruction video in 240p
Where is the horse??
Infinitely loading
you literally saved my ass for my physics final. THANK YOU!!
Sir, fluids are compressible. Gas is a fluid. Gas is compressible. Liquids are not compressible. The changing of volume when water is heated/cooled is due to the water becoming gaseous water. Hope you understand now.
All liquids are compressable the same as Gasses and some solids!
Refer to Haz-Mat Training from Federal D.O.T. and N.F.P.A.
In the Fire industry, Oil & Gas, Industrial and Commercial applications use C.A.F.S. ( Compressed Air Foam ) the foam is water ( Liquid ) based and when Both products are combined with enough Pressure, there is a cohesion that allows them to remain under Extreme pressure!
U take forever to draw
Why use the term "flow-rate"? Flow is, by definition, a rate. So actually, flow is: volume rate.
I know this is commonly used but I still cringe.
Flow rate z for both rates I guess
Liquids are not compressible sir...
in a perfect scientific world yeah... liquids arent compressible....
believe me that the density of water changes as you press them...
Lol thats not thought provoking at all. Solids are incompressible right? You put a rock that perfectly fits into a rubber ball, you cant press it. Liquids are like solids, just without a defined shape.