well from what I've studied, the pressure at point 2 isn't exactly 0. It would be equal to the atmospheric pressure. And I also believe that the pressure at point 1 isn't in the middle but rather at the edge and at the bottom of the piezo-tube, since the pressure in the middle of the pipe would be the dynamic pressure (since the fluid is obviously moving)
Great video, Donald. I always find it strange that american tutors seem to use specific weight, whereas over the pond in England we seem to take an extra step and take the product of density and gravity. Perhaps it's just a quirk of our respective countries.
Craig Schofield Nice that you noticed this difference!! I have noticed the Civil Engineering references tend to use specific weight. Other references, e.g., Mechanical Engineering, tend to use the product of density times gravity.
That is a great point, Donald. I must admit, at least from my experience in the UK, fluid mechanics seems to be the only course in which we don't use weight density. Whilst studying structures, soil mechanics, etc. we've always used weight density (kN/m^3).
Lukman Ali. Good question! The pressure variation across a section of a pipe is hydrostatic; thus, the pressure will vary linearly with radius and the pressure at the center of the pipe is the average pressure. If you use this value of pressure in your calculations, this will be give you the most accurate results. Thus, engineers nearly always apply or measure the pressure at the center of the pipe.
Because I am using gage pressure which is the difference between local pressure and atmospheric pressure. A gage pressure of 0 kPa means that the pressure at this point is equal to the atmospheric pressure.
The piezometer measures the piezometric pressure of a flowing liquid. If you know the local atmospheric pressure and the elevations, then you can calculate the pressure of the liquid that is flowing.
@@sangeethpmohan9223 Good Question! In the vertical direction, the forces on a fluid particle are weight and pressure only. This is same as in a stationary fluid. Thus, in the vertical direction the same equation applies to both a stationary fluid and a flowing fluid.
In fluid mechanics, hydrostatic means that the sum of the weight force and the pressure force acting on a fluid particle is zero. The fluid can be flowing; example flow in a river or a pipe. As engineers, we say that something is "static" when the sum of the forces is zero. This body may be moving at constant speed and still be static.
A piezoemeter is best used for measuring the pressure of a liquid, not a gas. Liquids in steady flow are commonly modeled as a material that is not compressible. For steady flow of a gas, one could use a manometer which is similar to a piezometer and also very simple.
With a very clear voice and practical explanation is easy to understand, even for people that speak little english
Thanks
I’m german but since i didnt find a german explanation to this, i looked at your video, and even i can understand it!
im surprised why every good teacher on you tube only
where is your verb? your sentence doesn't make any sense.
well from what I've studied, the pressure at point 2 isn't exactly 0. It would be equal to the atmospheric pressure. And I also believe that the pressure at point 1 isn't in the middle but rather at the edge and at the bottom of the piezo-tube, since the pressure in the middle of the pipe would be the dynamic pressure (since the fluid is obviously moving)
Great video, Donald. I always find it strange that american tutors seem to use specific weight, whereas over the pond in England we seem to take an extra step and take the product of density and gravity. Perhaps it's just a quirk of our respective countries.
Craig Schofield Nice that you noticed this difference!!
I have noticed the Civil Engineering references tend to use specific weight. Other references, e.g., Mechanical Engineering, tend to use the product of density times gravity.
That is a great point, Donald. I must admit, at least from my experience in the UK, fluid mechanics seems to be the only course in which we don't use weight density. Whilst studying structures, soil mechanics, etc. we've always used weight density (kN/m^3).
+Craig Schofield Specific weight is by definition the product of density and gravity. You may be confusing specific weight with specific gravity.
@@matthewdickinson5097 yeah quite true
Finally I can unerstand it, thank you.
Very simple, much help. Thanks.
Thank you, great video
Awesome explanation thank you!
Thank you! Finally i got it.
Hi, I am interested in what is the software you used here? This is so cool and can auto-correct hand writing drawing into a smooth cirve
Let me know if you know
@@YoloLollipops answer has been found (see other comment reply)
At 1:07 why water moves upward?????
I think it moves upwards due to capillarity 🤔
very nice video.
great video! what board app are you using?
great! thank you!
water pressure in pipe line at a point is shown by inserting piezometer and water enters in piezometer. Is it due to pascal's law or not.
Is piezometer an application of Bernoulli's equation? Or is it related to Bernoulli's equation?
Very nice work sir... Subscribed u😘😘... Can u explain how water flow rate is measured flowing through dam?... i.e. in cusec... Plz sir
can a piezometer be used to measure the pressure of a compressible fluid?
If the water is flowing in the pipe, does this change any of the math?
people : what this gotta do with life?
job for gaining salary : the hell your life.
sir, why are we taking specific value to measure the any pressure
Which software u used??? Plss tell
why is it taken from the middle of the pipe?
Lukman Ali. Good question! The pressure variation across a section of a pipe is hydrostatic; thus, the pressure will vary linearly with radius and the pressure at the center of the pipe is the average pressure. If you use this value of pressure in your calculations, this will be give you the most accurate results. Thus, engineers nearly always apply or measure the pressure at the center of the pipe.
thank you :D
@@DrDonElger will the elevation(h) change if we change the diameter of the piezometer?
wait ... but the pressure at the point 2 is equal to the atmospheric pressure not 0, isn't it ?
Yes, but he had calculate gauge pressure .
why piezometer ring is used?
is it suitable for measuring pressure below ambient
For pressure less than ambient, consider a different device such as a u-tube manometer.
Why is the pressure at point 2 equals to zero?
Because I am using gage pressure which is the difference between local pressure and atmospheric pressure. A gage pressure of 0 kPa means that the pressure at this point is equal to the atmospheric pressure.
can peizometer be used to measure the pressure of only the fluid which is in motion??
The piezometer measures the piezometric pressure of a flowing liquid. If you know the local atmospheric pressure and the elevations, then you can calculate the pressure of the liquid that is flowing.
@@DrDonElger sir how can we apply hydro static law on the flowing fluid region?
@@sangeethpmohan9223 Good Question! In the vertical direction, the forces on a fluid particle are weight and pressure only. This is same as in a stationary fluid. Thus, in the vertical direction the same equation applies to both a stationary fluid and a flowing fluid.
I have learned that piezometer is used to measure static liquid pressure,then why
fluid is moving
In fluid mechanics, hydrostatic means that the sum of the weight force and the pressure force acting on a fluid particle is zero. The fluid can be flowing; example flow in a river or a pipe. As engineers, we say that something is "static" when the sum of the forces is zero. This body may be moving at constant speed and still be static.
Donald Elger ohh,i got it now...thanks a lot friend...(y)
In Physics static means inertial frame of reference---the one in which net acceleration is zero & body can thus have a constant velocity.
delicate is
anybody else bothered by the missing arrow for indicating 'h'?🙈
🕵️🙏
Great video, Donald! Visit www.encardio.com for more details.
can a piezometer be used to measure the pressure of a compressible fluid?
A piezoemeter is best used for measuring the pressure of a liquid, not a gas. Liquids in steady flow are commonly modeled as a material that is not compressible. For steady flow of a gas, one could use a manometer which is similar to a piezometer and also very simple.