I built one at home using simple clear vinyl tubing and transmission fluid that somewhat resembles your demo model. I needed it to adjust the twin carburetors on a Yamaha V-Star 100cc motorcycle. I utilized an old carb jet in the tubing to dampen the pulses during measurement. One end of the tube went to one of the carburetors, and the other end of the tube went to the other carburetor. All I was needing is to balance the two equally. It worked beautifully.
Great video! It would be cool to include the equations you mention in the description, along with the conversion from water to mercury. It appears that only the density of the fluid changes how the measurement is taken, not the volume, is that true? Would you get the same readings for a water filled manometer that was 10x larger?
Is it possible to suck all of the fluid out of this if the vacuum is too strong? If so, do you need to size it a certain way to prevent this? I am trying to find the vacuum level on an unknown blower that I am re-purposing for a dust collection system.
ballzack57 You could absolutely draw out all the fluid from this device if the pressure is low enough in your vacuum. I am using water which would be easier to remove then lets say a more dense liquid like Hg.
MrGrodskiChemistry Thank you for your response. Can you just up-size the manometer to help prevent this? Does diameter or length of the tube affect this? Or both? Aren't you just changing the volume of water either way? But if volume affected this test, then the test is wholly inaccurate unless you take into account for the specific gravity of the water yes? Damn it to hell...I guess I'll just go buy a meter.
Great explanation! At the beginning you mention 190 mm of Hg, but I think you mean 190 mm of H2O. As mentioned later in the video, mercury and water have different densities so inches of Hg doesn't equal inches of H2O.
+Princess Wonderwoman Actually, I think he simply misspoke. He actually does have 190 mm of H2O. He was going back and forth talking about how mercury was originally used but he's using water, and I think just the wrong word came out. Cheers.
I was just wandering, if we do the experiment using barometer, will this give same rise of 190 mm HG or 190/2 mm Hg. Here in menometer, the length of Hg in one leg of manometer pushed downward same length of Hg is pushed upward in the other leg. I mean doubling the actual pressure difference. If you can explain this ...where I am wrong?
Does anyone explain the actual pressure?I mean if you apply pressure to the manometer one side obviously goes up.If it goes up 1 inch is it 1 inch H2O or 2 inches H2O by adding both side together ? There is not one single video or website anywhere to explains this.
+Jim Z (N2NXZ) If the pressure on one side of the manometer forces the liquid (water in this case ) 1 inch and the other side of the manometer is open to the atmosphere then the actual pressure (on the side of the manometer that is moving the water) is equal to the pressure needed to suspend the water one inch plus the pressure of the atmosphere that is applying and opposite pressure on the water. You see in order to move the liquid you need enough force to move the liquid up AGAINST the force of the atmospheric pressure in open side of the manometer thus the total pressure is sum of the pressure to support the weight of 1 inch (pushing down of gravity) and the opposing atmospheric pressure due to gas molecules colliding on the surface water.
+MrGrodskiChemistry My actual question was - For every half inch up on one side is 1 inch H2O? I know that half inch up on one side means half inch down on the other.Just add the 2 and the reading is 1 inch H2O?Some other websites are saying to mark the chart with one inch markings and some say 1/2 inch markings.Big difference between 2 inches or 1 inch of H2O.
The way that I always thought about this was to measure how much higher ( or lower) the second side was above (or below) the first regardless of the initial position. The bottom line is that the pressure in the first must support a column of liquid beyond the new position plus the atmosphere. So if there is an inch being supported above the new position of the liquid in the first side of the manometer then it's an inch. It really is as simple as that.
the mass of the liquid has something to do with it. but in this experiement, the increase of fluid level on the left is probably equal to the volume of gas inserted by the syringe. if not it would be interesting to see the deviation.
@@herchellelawrence7861 No, it we use water the height of water in the manometer as 19 mm then we must divide by the the density of Hg (13.6) to obtain 1.397 mm Hg supported. We change to Hg height because there is no pressure unit for height of water supported. Hg specific gravity is 13.6 more dense than water so the pressure from the syringe will support less of a heavier liquid. Now that unit of height of Hg is a torr and if we use the converting factor of 101325 Pa = 760 torr I get a value of 186 Pa. However since syringe's pressure is "pushing" against the open end of the manomete , the186Pa is the extra pressure beyond the atmospheric pressure. To get the pressure in the syringe we add the 186 to the atmospheric pressure ( I will assume standard = 101325 Pa) = 186 Pa + 101325Pa = 101511Pa. Maintaining 3 significant figures, 102000 Pa.
@@herchellelawrence7861 Are you looking for just the difference in pressure between the 2 systems? Normally manometers measure an unknown systems pressure by the height of a column or liquid and a known value of the pressure of another system. If you are looking for just the difference in pressure the value would be 186 Pa based on the video.
Most people will wonder what's the significance or usefulness of such an apparatus?. Manometers are all around in industrial use, just as other kinds of pressure reading instruments and tools are commonplace, for our industrialized society. Municipal waste operations use manometers to monitor and aid in the production of gasses. Fermentation processes utilize manometer instruments, and so on..
Uh.. this answered my question for sure, but it's a bit like explaining 2+2 repeatedly with blocks... Are people really this stupid? It's a pressure measuring device... Done in 5 words.
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I built one at home using simple clear vinyl tubing and transmission fluid that somewhat resembles your demo model. I needed it to adjust the twin carburetors on a Yamaha V-Star 100cc motorcycle. I utilized an old carb jet in the tubing to dampen the pulses during measurement. One end of the tube went to one of the carburetors, and the other end of the tube went to the other carburetor. All I was needing is to balance the two equally. It worked beautifully.
Nice!
The Bell and subsequent background conversations make this video authentic...
That's very informative and clearly presented, thank you a lot!
Brilliant! Thanks! Helped a lot to understand the concept
Great video! It would be cool to include the equations you mention in the description, along with the conversion from water to mercury. It appears that only the density of the fluid changes how the measurement is taken, not the volume, is that true? Would you get the same readings for a water filled manometer that was 10x larger?
“Can I say hi in your video?”
best one i could find thanks a lot. helped me with my studies
my son understood this very clearly today....thanks
Your Welcome!
Thanks for making this video. It really helped
what is that liquid made of ........... and the pipe ...... is it plastic or rubber
Is it possible to suck all of the fluid out of this if the vacuum is too strong? If so, do you need to size it a certain way to prevent this? I am trying to find the vacuum level on an unknown blower that I am re-purposing for a dust collection system.
ballzack57 You could absolutely draw out all the fluid from this device if the pressure is low enough in your vacuum. I am using water which would be easier to remove then lets say a more dense liquid like Hg.
MrGrodskiChemistry Thank you for your response. Can you just up-size the manometer to help prevent this? Does diameter or length of the tube affect this? Or both? Aren't you just changing the volume of water either way? But if volume affected this test, then the test is wholly inaccurate unless you take into account for the specific gravity of the water yes? Damn it to hell...I guess I'll just go buy a meter.
Thanks sir for explaining the manometer in such a great way .. thanks a lot and make more n more such amazing videos...
Is this closed end or open
A video with simple u-tube manometer calibration (in Pascal or mBar) would be very useful, it allow to add a proper scale for direct reading.
what are the materials required to make this manometer??????
can you help me please ? what kind of alcohol and oil is used in manometers instead of mercury ?
Butylphathalyte....or buytle fluid....contact a local neon sign supply....or someone who rebuilds vacuum pumps
Thank you for this demo.
wonderful explaination,(you can be an great teacher)
Great explanation! At the beginning you mention 190 mm of Hg, but I think you mean 190 mm of H2O. As mentioned later in the video, mercury and water have different densities so inches of Hg doesn't equal inches of H2O.
+House of Hacks I think he said to pretend it's mercury because the original contains Mercury but not this one. :)
+Princess Wonderwoman Actually, I think he simply misspoke. He actually does have 190 mm of H2O. He was going back and forth talking about how mercury was originally used but he's using water, and I think just the wrong word came out. Cheers.
I was just wandering, if we do the experiment using barometer, will this give same rise of 190 mm HG or 190/2 mm Hg. Here in menometer, the length of Hg in one leg of manometer pushed downward same length of Hg is pushed upward in the other leg. I mean doubling the actual pressure difference. If you can explain this ...where I am wrong?
a Barometer is just an open tube on one end and thus there would be just one "leg" to measure.
Where did you purchase this manometer? Trying to do a similar demonstration
loved it ahh i miss USA very cool teacher!!
How is your mercury of manometer green colour
Nice video on the subject matter
Manometer is give absolute or gauge pressure?
absolute if you know the current atmospheric pressure.
@@MrGrodskiChemistry yes but, difference in manometer tell us gauge pressure?
Does anyone explain the actual pressure?I mean if you apply pressure to the manometer one side obviously goes up.If it goes up 1 inch is it 1 inch H2O or 2 inches H2O by adding both side together ? There is not one single video or website anywhere to explains this.
+Jim Z (N2NXZ) If the pressure on one side of the manometer forces the liquid (water in this case ) 1 inch and the other side of the manometer is open to the atmosphere then the actual pressure (on the side of the manometer that is moving the water) is equal to the pressure needed to suspend the water one inch plus the pressure of the atmosphere that is applying and opposite pressure on the water. You see in order to move the liquid you need enough force to move the liquid up AGAINST the force of the atmospheric pressure in open side of the manometer thus the total pressure is sum of the pressure to support the weight of 1 inch (pushing down of gravity) and the opposing atmospheric pressure due to gas molecules colliding on the surface water.
+MrGrodskiChemistry My actual question was - For every half inch up on one side is 1 inch H2O? I know that half inch up on one side means half inch down on the other.Just add the 2 and the reading is 1 inch H2O?Some other websites are saying to mark the chart with one inch markings and some say 1/2 inch markings.Big difference between 2 inches or 1 inch of H2O.
The way that I always thought about this was to measure how much higher ( or lower) the second side was above (or below) the first regardless of the initial position. The bottom line is that the pressure in the first must support a column of liquid beyond the new position plus the atmosphere. So if there is an inch being supported above the new position of the liquid in the first side of the manometer then it's an inch. It really is as simple as that.
Is the tube open
Yes tube is open.
Thank you
Great video.. I would like to know which type of manometer is appropriate to measure 10 Inch WC, is it water or mercury manometer?
Dandool Shehzaad Ally u have one the toilet, when u close the door and open you can see it lol try u will see it
how i suppose to remove the bubbles when i using U tube manometer
I do not understand your question.
well!! Its quiet easy. Insert a stick and remove it(Repeat it 2-3 time). it would make all bubbles out.
Thank you so much I have learn more about it
Wait so can someone tell me what was the fluid inside the U -TUBE
Nice explanation. Good one :)
the mass of the liquid has something to do with it. but in this experiement, the increase of fluid level on the left is probably equal to the volume of gas inserted by the syringe. if not it would be interesting to see the deviation.
pleade can you make videos on SALT ANALYSIS
Can u tell me how to measure steaty state height of u tube manometer
kalpana sharma - hey .. r u civil engg
So the pressure will be 0.19Pa?
Please do reply
Are we assuming the liquid is Hg or using the water?
Sir I supose water
@@herchellelawrence7861 No, it we use water the height of water in the manometer as 19 mm then we must divide by the the density of Hg (13.6) to obtain 1.397 mm Hg supported. We change to Hg height because there is no pressure unit for height of water supported. Hg specific gravity is 13.6 more dense than water so the pressure from the syringe will support less of a heavier liquid.
Now that unit of height of Hg is a torr and if we use the converting factor of 101325 Pa = 760 torr I get a value of 186 Pa. However since syringe's pressure is "pushing" against the open end of the manomete , the186Pa is the extra pressure beyond the atmospheric pressure. To get the pressure in the syringe we add the 186 to the atmospheric pressure ( I will assume standard = 101325 Pa) = 186 Pa + 101325Pa = 101511Pa. Maintaining 3 significant figures, 102000 Pa.
I am gratefull for your help sir.
But can't we calculate the pressure by the difference of the liquid levels.?
@@herchellelawrence7861 Are you looking for just the difference in pressure between the 2 systems? Normally manometers measure an unknown systems pressure by the height of a column or liquid and a known value of the pressure of another system.
If you are looking for just the difference in pressure the value would be 186 Pa based on the video.
Nice setup! May I ask where did you buy it? Thanks!!
Spacecraft Robotics and Control Lab I believe I got it from WARDS or Frey.
can u make a video on 'how to make a manometer at home?' if u can, no "pressure"
haha get it
@@kabirbaghel3630 rude
Dad stop making jokes
I thought your dad left 11 years ago
@@m.a997 I know. But he still posts on youtube sometimes
Not much to get
Nice explanation but I would prefer a funnel
It really helped me on my exam.
Glad to help!
why are you reading when the ruler reading not equal to zero
Most people will wonder what's the significance or usefulness of such an apparatus?. Manometers are all around in industrial use, just as other kinds of pressure reading instruments and tools are commonplace, for our industrialized society. Municipal waste operations use manometers to monitor and aid in the production of gasses. Fermentation processes utilize manometer instruments, and so on..
Agreed! Also Pressure was "discovered" using the first manometer by Torricelli.
Very nice
Excellent excellent excellent
Very helpful
thank you sir it helped :)
Great job, thanks.
this is really helpful! thank you
There was a poor girl who wanted to say hi in your video... Why didn't u let her???
clear explanation. thank you
Nice
Thank you so much, sir.
Thanks sir
Good video....however, surely 190mm is equal to 190 Torr not 1 Torr as you state in your video....maybe a slip of the tongue.
I am seeing this video in 2022 and this video was uploaded in 2013
Better late than never!!!
1:37
3:12
4:10
Thank u
Welcome
bravo
Thanku sir!
You're welcome!
Most confusing explanation of a manometer function.
K N O W L E D G E
Un cra el loco
Who are in class 8th?
To watch video
I rem those awful tables.
Uh.. this answered my question for sure, but it's a bit like explaining 2+2 repeatedly with blocks... Are people really this stupid? It's a pressure measuring device... Done in 5 words.
No offence to the poster, he explained what I wanted to know. More of an observation on the way he needs to frame it for the audience...
Hindi me bolo,
🤨🤨🤨
Ok ok ok ok ok ok ok ok
waste
WASTEWASTEWASTEWASTEWASTE