Pressure at a depth in a fluid | Fluids | Physics | Khan Academy

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Sal finishes the calculation or work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principal. Created by Sal Khan.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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[@269Tanya]

Sal Khan = gift from God!

[@visulahametikalla1688]

Know that every person is a gift from god to the earth

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@@visulahametikalla1688 😐

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he is our our Bangladesh's PROUD ,,

[@mohamedmotaz5194]

@@sourav3000-h4x sry sal isn't LGBTQ

[@anava84]

Yo its P sub d and im listening to my pal, Sal He'll tell you everything about Pascal. But don't worry, he wont make it complicated What he will do is make your teacher seem overrated! My man Sal's main mission Is to make physics part of your intuition! Its P sub d and im over and out! Sal is the best beyond any doubt! [dont hate. participate ;)]

[@ankitaaarya]

Aint hatin', participatin' Sals methods, elucidating His knowledge, exuberating

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If I could like this twice, I would

[@markyden]

@@ankitaaaryabars be 🔥🔥

[@Aequorine]

@@ankitaaarya 14 years after these original comments people still be lookin at Sal's physics lessons people like me have an exam to ace but as long as Sal's alive there is nothing we can't face Sometimes when my teacher be babblin Sal's physics lessons are things I be searchin So no matter how old or decomposed these comments are We will carry Sal's legacy really really far!

[@elenareixa6480]

I'm studying physics and Khan Academy is making me keep on moving, thanks god, there was a time in witch i couldnt see the light

[@luongmaihunggia]

"there was a time in which I couldn't see the light" Wow!

[@luongmaihunggia]

Trahn-Jahn lol

[@RobsonOliveira-yw9tf]

"hikari" > "light"

[@ankitaaarya]

Good luck for your future, if you're still doing physics.

[@sjlegends]

No light, haha, photons are not happy

[@sigirigorilla5570]

...gotten rid of the atmosphere. That's very negative, so we wont think about it..." solutions to all your problems in life

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You are the only reason I'm going to pass physics this semester.

[@fahadfarooq8876]

Hmm liar

[@Waeweas]

Well... did you pass?

[@user-sl4vj5sw8t]

Thanks 😊 sir . 9 minutes ago i had no clue about this topic, but you derivating this equation simplified everything in my Physics Prac book.

[@ZakariaElwalily]

F=PHAG now you will never forget

[@madhurimabhandari1559]

no wrong it's not P its row plz its wrong P is pressure

[@AkashCherukuri]

+madhurima bhandari its NOT even 'row', its 'rho'. A greek alphabet.

[@BibijIvoirienne]

12 years later..still watching 💕

[@Aditya-nf6sy]

15🙂

[@This_comeback_is_personal]

man, i just love you, the jokes that you make during the video had me dead. I am having a good time and i am learning at the same time.

[@lusianasutanto5863]

Yes.. I agree with the rest of the comment that you explain well..and clearly...bravo...and thank u

[@popandu8297]

I love these videos ... they are so clear and informative! A* The only thing that could be improved is the accuracy of the drawing : )

[@ashmano23]

Sal, you are a life saver. Really, when you teach everything makes sense. Thank you so much. May God bless you. :')

[@maximberestnev1934]

downward force = density times volume times gravity

[@mattphorwich]

Groovy for engineering... deep ocean and other planets expiration as well. Dig the educational videos... limitless potential!

[@RobertWilliams-mk8pl]

I like the different colors.

[@shouryarai2624]

I thought u were the teacher I needed then u wrote g=9.8 instead of 10... By the way Thanq for the Vdo 💓

[@KP-wc6hm]

Just perfect

[@AzharPsas93]

Great explanation ❤

[@TheLokomente]

Could you please make a video on the limit version of pressure? Where pressure = lim( Fnormal/A ) as A goes to A’ , where A’ is the area at a point in a fluid at rest.

[@jayasreepatil8960]

U explained it clearly sir

[@eliteessence831]

THis is awesome and it’s seriously 12 years old and now I’m watching it with popcorn

[@Be1smaht]

Good practice is to derive this all BY yourself. YOu'll know this stuff so well if you do that.

[@88yodnom]

1:16 "That's very negative, so we won't think about that." #swag

[@lazaraado]

this was the exact question on the thing i was stuck on!! thank you so much

[@sofiahazima2556]

heyooo, I have a question: sometimes, the force exerted on the upwards direction is calculated by this equation: F'= (P+ΔP) x A. What does the ΔP stand for? I really can't understand this equation, as the force upwards is equal to the force downwards... keep up your videos, I've already subscribed to your channel and also registered to your page! thank you for making physics so more interesting :)

[@garretthayes5393]

7:17 haha

[@vidr5857]

You teach patiently sir

[@josephlimotan8475]

is a good teacher better than my teacher in the Philippines

[@MrWadeBarrett]

Thank you, you are doing an excellent job! Really, thank you so much!

[@minimee2908]

You still there?

[@JackAdrianZappa]

I'm confused. Density is a function of pressure. Pressure is a function of height. Mass of the liquid above the reference point can't be just *area * height * density* as density is constantly varying over height.

[@feynstein1004]

6:15 That's only true for cylindrical vessels. If you instead assume a conical vessel, the volume would be 1/3*A*h and so you get P=1/3*p*g*h Could anyone explain this to me please? It's been bothering me for 12 years 😖

[@RXMK-wx5ih]

Thank you very much sir , it so clear lol

[@saravananr9485]

should the gravity be taken with -ve sign for force upward?

[@ThunderFoxMusic]

lol, the solar winds blew the air away xD "That's very negative, so lets not talk about that" funny man, man!

[@alektad]

This is so educational and so entertaining at the same time. Good to know that F=phag, xD

[@wesleyyator8488]

integrating ict in teaching made more enjoyable

[@thienfoil]

this is awesome

[@MrDoduare]

lol at 6:39 he spells phag :D I love your videos Sal and I know they'll help me on my AP physics test tomorrow

[@rishabdutta2135]

What is providing the upward force???

[@psbbiaku640]

hey sal I am ur no. 1 fan

[@aquarian1295]

yep

[@mrigankusaharia1741]

8:24 this little piece of ...... Foil 😄

[@kim15742]

Well ρ is not p

[@ripansharma5259]

Thanks for the information sir😂😂

[@fddgghffgyhvcf7679]

nice

[@truth3137]

Here, it's assumed that the circular foil is of negligible mass, otherwise, the foil would accelerate downwards, I'm sure. The foil is just used as an indicator. The air is also a fluid, it also has a pressure on our bodies. The higher you gob the lesser the pressure. That's why sometimes blood comes out of the nose of a mountaineer , as the atmospheric pressure keeps our blood pressure sustainable. When this atmospheric pressure decreases then the blood pressure becomes relatively more, thus the blood vessels tear out and blood leaks out. A horrific situation !!!!!:v

[@aratisinha6572]

Sir is pressure at a depth h in a fluid is equal to the pressure outside the fluid plus the fluid

[@megaelliott]

2:40

[@hhkhan87]

I'm a forth graders and I'm watching this!!!!!

[@magnus4770]

you are definately not a fourth grader

[@greent26tube]

@anava84 YESSSSSSSSS!!!!! MEGA WIN HERE.

[@cybourg]

Haha.... "Lets Not Call It Water"... the blooper just make the whole lecture sound interesting.

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Are you still using this account?

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@anava84 mic check 1 2 one 2!

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Who dislikes this guy?

[@ezalcinoryahoocom]

isn't it suppose 2 be 980,000Pa , if im not mistaken

[@BluegrassHomestead]

And what is G? where I the formula for gravity. you found P, and then stopped. What is G? Can you use both Density and Gravity if they are in essence the same thing? Prove gravity.

[@TurbotortoiseStickle]

Now I want to eat melted marshmellows with a lead spoon. : )

[@pujithasandakelum9067]

hw cn we keep water as a liquid in a vacum :D im just kidding hahaa thnks for these free education :)

[@tirsosrabenoja9510]

Please help me guys.. Where did he get the 10m for the height? Thank you.

[@sherazkhan2802]

Tirso Sr Abenoja That was just a random value .

[@ripansharma5259]

Lol

[@gairick9]

bob ross of science

[@nausheenfaruqui9061]

Hi

[@KungShu69]

If I had a dime for every pixel this video has I would have roughly seven cents.Good content though.

[@kashifnadeem2137]

your voice is changed or seems to be disturbed

[@kashifnadeem2137]

Yeah man

[@anthonyabadia3984]

Did anyone not HOLLER at 6:47

[@ShaharHarshuv]

OK guys who is doing a rap album titled P-sub-D

[@ThunderFoxMusic]

cubic meter of marshmallows XP and feathers!

[@tibyanabdullahi5786]

Me watching this on 2022

[@ryukseyes]

great lesson thx! btw 'lead is more dense than marshmallows' lol

[@bjdooi]

p sub d rap sensation supreme

[@sodr2]

lmao, sick rap!! and vid of course... no need for my teacher

[@2007excalibur2007]

@anava84 lmao

[@adityasinha4515]

1000*10*9.8 = 9800 not 98000. lol

[@apatheticmillennial5114]

aditya sinha no it's correct you idiot

[@iranzinellygentille413]

Amazinggggggggggg

[@zareenafatima5333]

waste

[@renatod8777]

Did you just write p.h.a.g ? That's it, you just proved that physics is misogynistic and racist .

[@tasfiatahsin2510]

Tried to make an unfunny joke. But still missed the mark.

[@null3070]

@@tasfiatahsin2510 chill