Introduction to Manometers: Two Essential Rules

[moviericky]

Oh my goodness...You're left handed!

[frahs993]

shouldn't it be volume, not height?

[itsd4real]

Dr. Morrison can you please do a mor complicated manometer where there's more than 2 arms and more than 2 liquids with different density an with both ends of the manometer closed. Thank you

[MattSpon]

good vid! the guitar was WAY too overbearing for my ears.

[MattSpon]

@MattSpon Haha! My bad... that was king crimson playing on my itunes! lol wow and I'm in the health sciences... look out.

[jimmertzis]

so basically PA-PB=ρg*g*h1?

[NuclearDispute]

For those of us who are familiar with tranposition and the fact that rho is the density of the substance, i.e. water = 1000, I dont think it was clearly explained what rho meant in your video? Presumably a certain amount of this you are expecting your viewers to understand, for instance g - gravity - 9.81 m/s^2 ?

[phoebelala]

Brilliant but very dull. Life is short, go get a beer.

[zakariyya90]

thankkkss a lot now i can sit my fluids exam!

[anks181190]

AWESOME.....

THANKS A LOT MA'M....U MADE IT SO SIMPLE FOR ME TO UNDERSTAND THE THING.... THANKS ALOT..

[jannarodriguez95348]

Thank you so much for explaining the pitot static tube problem! Awesome!

[LINEHACKER]

thanks a bunch now i can go make my own manometer , before this though my calculations would be off by Pa = 1 atmosphere.No one could teach me how to tie a tie ,that is untell lady did.

[kungman190]

Thank you

[vibeflyer]

I love clever ladies, I bet your a really good looking lass

[KrishanBorwal]

Thanks a lot ! :)

[strongwiller]

thanx. now i can get my chemical engineering degree. very helpful vid =)

[awana79]

Thank you!! That really helped!! Your a life saver!!

[NMLP1]

this stuff doesnt make any senseeeeeeeeeeeeeeeeeeeeeeeeee­eeeeeeeeeeee help meeeeeeeeeeeeee

[Bahbohram]

Hello from Sydney!

thanks for the video lesson, very easy to understand. Fluids seems like the hardest course for me this semester. not looking forward to turbomachinery.

thanks for the video =D

[chellyash]

thanks.your explanation really helped me.

[Sharod101]

that did not help me what-so-ever. the one day i don't pay attention in class we actually learn something i didn't already know how to do.

oh well, thanks for posting anyways.

the method in our bok is completely different (ideal gasses).

[DrMorrisonMTU]

If I understand your question correctly, you have the b-side open to air (and the pressure at the top is Patm) and the a-side open to some other pressure Pa. If you do it my way, you get rho*g*h+Patm=Pa. In this case Pa is the absolute pressure. If you do it your tutor's way and say the pressure at the top is zero (gauge pressure), then you get rho*g*h=Pa but now Pa is in gauge pressure. In typical gauges, they read zero when open to atmosphere.

[rallyx8]

Hi.This will really help me in my test which is coming up in few days...but i have a question dat really confuses me

ok so we have P1=P2 wher the top pressure from each side is Pa and Pb respectivly.what if we have one side open to air.lets say Pb end is open to atmospher.therfore Pb wil be equal to atmospheric pressure right? But why does my tutor never take that atmsperic presure in consideration wen doing the calculation.he's P2 in this case wud simply be rho(of fluid g)*gravity*h1.how come?

[divinenuker]

Its a good basic explanation.. but if the manometer problem is really complicated.

Where you have multiple (Jump Across Points) P1 = P2

P3=P4 , P5=P6 , and the some "Jump Across Points" are on the top so the "column" is actually inverted.

In the end if you want the pressure difference between the entry and the exit.. how would you add them together using your method. I can't figure it out. It gets messy

[DrMorrisonMTU]

Hi, for the complex case you cite, you need to choose "jump across points" that are in the same fluid and not at the top, but at the bottom. Always remember that the pressure is the same in the same continuous fluid at the same elevation. I will try to post a video on this. Dr. Morrison

[divinenuker]

Greetings Dr Morrison, I was just wondering if you made a tiny mistake or perhaps I'm wrong. Starting at 3:00 of the video, you say that the pressure at the bottom ( P1) is (PA)(rho)(g)(h1+h2), shouldn't it be PA + (rho)(g)(h1+h2)

[divinenuker]

Oh never mind, i shouldve watched the video further you corrected yourself. Sorry!

[luthmhor]

Great explanation.

This shows how they derive all the formulas for these kinds of problems, awesome. Too bad my teacher never showed this, or never explained these connnections to the formulae. This was takes longer but it makes a lot more sense to me then just random formulas.

[mmaaeai]

thnx Dr.faith U R the best

[TheSurya786]

did u invent thermodynamics

[c10seth]

my fluids professor could take a lesson from you b/c that 5 min video made more sense than most of my semester. Good job.

[Dinty51]

@c10seth two days before my first fluids test and those are my exact thoughts!!!!!!

[phoebelala]

thats what I was going to say!