Measuring Pressure With Barometers and Manometers
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- Опубликовано: 16 июн 2024
- We've learned a lot about the phenomenon of pressure, so how exactly do we measure it? There are a few different devices that serve different purposes. Barometers measure atmospheric pressure, while manometers measure the pressure of an isolated gas. Let's get a closer look!
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0:58 Barometer
2:33 Hydrostatic Pressure
4:02 Manometer, measuring pressure exerted by trapped gas
5:00 Finding gaseous pressure
7:36 Comprehension Check
Came here for a simple explanation of a barometer 2 weeks ago, left with more knowledge and this weeks study material on manometers and atmospheric pressure testing for boiler draft. came back to say thank you for the thorough explanation, and great animated imaging for each. 10/10.
Well spoken, nicely explained and much better than the recording in my class. Nice job and thank you.
Amazing content, I love you for letting me understand this concept in such an easy manner, Subscribed
Wow, I wasn't expecting the hair cut!! But great video thx! It really helps me explain things to my students. I often make them watch your videos for homework :)
so far, i really enjoy your explanation. hopefully, i wish you make more content in your videos. thanks
Simple and clear explanation. Great video.
Thanks!
THANK YOU SO MUCH I UNDERSTOOD EVERY DETAIL🖤
Working to understand measuring pressure in a mechanical refrigeration system. Thanks for the help Dave.
Excellent work. Thank you for the educational material.
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EXCELLENT!! THIS HELPS ME A LOT!
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Bruh a 7 minute video for free taught me more than the 1 hour lessons in school that cost us 1k a year
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Great video!
Hi. Do you know a standalone instrument that can measure the pressure inside a hyperbaric chamber in ATA or psi. Is there a wrist worn unit that can do this. Thanks for your help.
It was wonderful thanks
Good one!
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Hey professor dave! I have loved your videos for a really long time, they helped me ace chemistry and physics.
Question for you. I work in a brewery and my co worker and I were discussing pressure of a closed system. Our fermentors have a sealable door and a pressure gauge that reads between 0-30psi. We were discussing why, if at sea level 1 atm/14psi of pressure is acting on us due to atmosphere, why when do you seal a tank does it not have 14 psi worth of captured pressure and read at 14 psi.
My coworker thought it was additive and that it is 1 atm + what ever additional pressure you add to the tank. So effectively the gauge is tarred at 1 atm.
My thoughts are that the diaphragm pressure gauges are not designed to translate barometric pressure into something readable on the tank and thus only when you have a fluid or added gas to the tank do you see the translation to a reading on the gauge.
From this video i would think that then if we were to use a manometer that we would see that 1 atm of pressure acting on the fluid in the manometer?
Unless there is a specific reason you would need a gauge that reads absolute pressure, most pressure gauges are built to display the vented gauge pressure, rather than absolute pressure, since it is much more economical to make a gauge for vented gauge pressure relative to the background atmosphere, than one for absolute pressure. It is the entire reason why a gauge is the namesake of gauge pressure.
So this means that whatever pressure you measure on the gauge, is really that plus 14.7 psi that you'd need to use in any equation that depends on absolute pressure. If you used a manometer with a vacuum on one side, you'd have an absolute pressure measurement device.
Hi. I found this channel because of the flat earth stuff, but I can't stop watching your videos. It's so annoying to not understand it all, but at the same time a good feeling. Thanks man ♠️
thanks prof
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Did you make a mistake in saying that the density is 13.6grams.. because the unit conversions is off. (going from grams to kilograms gives you a smaller number.)
You explained perfectly except when you got to the part about pressure of a gas but the atmospheric pressure exerts more pressure and the subtraction which confuses me
Quick question, what happens to the levels on the right side and left side of a Utube manometer when the gas pressure reduces by for example 20 of mercury
The mercury would rise on the exposed side, and fall on the sealed side, if the external gas pressure decreased.
A manometer set up to measure atmospheric pressure, would have a vacuum on the left, and exposure to the atmosphere on the right. When measuring a standard atmosphere, there would be a 760 mm difference between the mercury levels on the left and the right side.
Suppose the two sides of the U, are 1 meter tall, and suppose the mercury level is 10 cm below its top on the sealed left side, when measuring a standard atmosphere. This means the right side will be 14 cm above the bottom, since the left side is 90 cm above the bottom, and 90 cm - 14 cm = 760 mm. If you take this manometer to a higher elevation, where the external pressure drops by 20 mmHg, then the mercury on the left will drop to 89 cm above the bottom, and the mercury on the right will rise to 15 cm above the bottom. The difference then, will be 74 cm, corresponding to 740 mmHg of pressure.
I saw the notification for this video immediately I opened it
Can i know the name of app u use it to draw manometer
Please if the pressure exerted by the gas on the mercury is greater than the atmospheric pressure, does the atmospheric pressure still have an effect on the mercury to cause it to move even just a little bit?
Yes it does
So helpful
professor Dave I have just noticed that if you search up how estrogen stops growth you get no results actually explaining how estrogen speeds up your bone age. I would highly appreciate if you were to rectify this issue on RUclips as I think it would make an interesting video and no one else appease to have made a video explaining this.
Isn't the Hydrostatic pressure also called Manometric pressure?
Manometer: used to measure pressure
Mahnamahnameter: used to measure Muppets
I am beyond proud of this comment.
But in the closed-end manometer, what gas is above the liquid on the right side? Doesn't the pressure exerted by the gas in the vessel then also depend on the gas exerted by the gas on the right?
I believe it's a vacuum on the other end so there is no other pressure to factor in.
@@ProfessorDaveExplains Ok thank you Dave! 😌
Omgg this can't be true,I was just studying physics specifically manometers,barometers and so and I was very confused then I checked my phone to see the notification,wow
so it means ur a MAD
@@aravshah1644 man I don’t even remember writing this comment chill
great vid
Hi Dave! Long time.. No questions, just here to say 'hi!
Oof he ignored you for over a Year
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Thank u prof. You look good btw
I wish you had done an anaroid barometer as well 🧐
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2:10 density of water 0.997? At which temperature and pressure?
It is 1 g/cc at 4 degree celsius , hence when the temperature changes it also changes
Me :sees the notification
Me : clicks immediately
Reaction time : am I a joke to u
this made me chuckle
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omg
Reaction time? As in the RUclips channel?
not at all hilarious... practise more mate...
What is efficiency of barometer Aniroid barometer
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@@aravshah1644 arey bhai kahana kya chahtey ho??
Thanks, got my igcse physics test next Wednesday
Did you pass?
@@preciousoh705 Don't know yet, it requires at least one month to receive the result.
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@@preciousoh705 Thank you! I hope you have a wonderful day! Stranger on the internet 😊
o levels or a levels?
2:33
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Bruh it is fluid mechanics
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Which accent is speaker speaking? Can anyone please reply
I'm American.
In maths, why do you not show how do we get the answer?
Let's check the blood pressure
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Thank you for sharing this great explanation
I know a few flattards that need to learn about this stuff lol
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Yea but you can't have pressure without a container, it breaks the 2nd law of thermodynamics. Prove we can have pressure.
-Nathan Oakley's message INCOMING
The atmosphere is attracted to earth due to gravity. There is nothing about this that violates thermodynamics whatsoever.
@@ProfessorDaveExplains I actually don't deny that. Flat earthers are obviously denying gravity, but bring the second law of thermodynamics in to explain the definition of gas pressure "force exerts on walls of container", so they end up saying there is a dome lol. Doesn't the second law apply to isolated systems only? What type of system is earth, it seems like sources vary.
@@TimOsman The second law of thermodynamics applies *in general*, it is just that it is easier to explain it for isolated systems when first introducing it. So stating it in the form of "isolated systems cannot decrease in their entropy", allows us to demonstrate this with examples where half the system gains entropy, the other half decreases in entropy, and the system as a whole increases in entropy. Using an isolated system as an example, allows us to put aside entropy exchange with the surroundings, and focus on what happens in the system alone.
The most generalized form of the second law of thermodynamics, is as follows:
The entropy of the universe cannot decrease
The universe is ultimately an isolated system as far as we know, so that means any entropy generated in a given process, must go somewhere, and cannot cease to exist. Entropy of the universe can remain unchanged due to the special case of a reversible process, but it cannot decrease.
@@TimOsman Earth ultimately is an open system. The reason you get conflicting answers on this, is that for the most part, it is close enough to a closed system that you can neglect mass transfer due to whatever we gain from meteors, lose from solar wind, or lose from manmade spaceflight activity. The Earth certainly isn't an isolated system, because it gains heat from the sunlight, and radiates heat away to the cosmic background (the entire reason it cools off at night). The radiation heat transfer to the cosmic background, is what enables Earth to transfer entropy away to the rest of the universe.
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Make a barometer holding one crore litres of💧💧💧 water💧💦 so it's become a great👍 source of🔌 energy⚡⚡⚡⚡ forever😁😁😁😁
One crore litres volume barometer produced how much pressure for making electric🔌⚡ power💪⚡ forever😁😁😁
If we used one crore manometer and a common output for all of them so it's become a great source for energy⚡ or not 🤣🤣🤣🤣
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