For those who are Interested. You can calculate the pressure from the height of the mercury column, from the given formula: Pressure = density * gravity.c * height of the column Mercury is mostly used due to it's high density. Comparing this to water, we would need a column of around 10m.
Wow, that is a fantastically interesting effect! So it doesn't matter how much mercury you have to begin with in either the tube or the glass, the level always equalizes around the same height in mm. That is really neat.
I built this at my home during middle school using science supply store bought mercury and glass tubes. I also built a working seismometer fitted with real precalibrated pendulums and paper advancement mechanisms around the same time. I thought I was pretty good until I see news of a 16 year old kid building a fusion reactor at home recently 😅
The mercury barometer is one of the most reliable and accurate types of barometers in measuring atmospheric pressure, but the problem is that it needs a horizontally stable table.
Thank you for the experiment just i have a question and i will be so delighted if you answer me , why isnt the size of the tubes important? I think it can change the hight of the mercury.
Pressure= h rho g = height * density of fluid * acceleration due to gravity... In short : pressure is proportional to the height of the fluid column only... Google for more pl
So I conclude that this day the atmospheric pressure was about 988 hPa (14.33 psi) in that laboratory(when the temperature was about 20°C/ 68°F). Slightly lower than usual at about 124m (407 ft) height above sea level
No, until and unless there is space to allow air molecules to get in the vaccum made above. It will happen when intermolecular forces are much more to hold the mercury molecules to counterbalance the weight of mercury below the 744 mm. I mean mecruy gets solidified. If it is in liquid then mercury molecules below the 744mm( below thin layer of mercury molecules) aren't capable of holding the weight of mercury below that line.. Then air will suck into the vaccum hehehe
@@ThePeterDislikeShow Just use the formula 101325 / (9.81 * density_of_fluid [kg/m3] ) = height [m] Here 101,325 Pa is the atmospheric pressure, and 9.81 m/s/s is the acceleration due to gravity.
If you look at the formula , atmospheric pressure is equals to height of mercury column multiply by the density of mercury and gravitational field strength , since it does not include the area , the area makes no difference
If it will be in vaccum then level of Mercury will drop completely as no atmospheric pressure will me there and only mg will be there which is already same and it wiil be completely poured in beaker
There are several ways to explain this phenomenon, & different people have different ways to understand. it might be easier to understand if I used a "J" shaped tube. If I can fill it up while it is horizontal, and then stand it up like a 'J', then the miles of air above the open end are pushing down on the lower part on the 'J', but because the tube is sealed, the air cannot push down at all on the taller side. Only the weight of the extra mercury is pushing down on the tall side. . This is similar to a see-saw with several hundred loaves of bread stacked high on one side (the air) and only you (the denser Mercury) on the other side to balance the see-saw. If the air pressure drops (fewer loaves), that end rises, and you (on the other side) also drop.
one cm square area gives one kg force exerted by atmospheric pressures so one lakh cm square surface gives one lakh kg force exerted by atmospheric pressures this means only one kilometres squares surface gives 25000 kg force minimum we can increase surface area by staking and making building so each story of building gives 25000 kg force exerted by atmospheric pressures joint force will turned the turbine easily forever since Florida is very stormy area and air pressure always changing we got powerhouse cheapest way indeed
all Americans are invited to do something about android's barometer at very large scale one kilometres squares surface barometer sensing device sac cylinders will receive tremendous pressure which can easily push or pulled leverage system and we can produce electricity forever by leverage principles and gearbox based system which turned out turbine and generators setup so we got electricity in Florida we have very stormy conditions so this type of barometer sensing device turned rapidly and gives many MW electricity per day whole Florida become a power generators and Americans going to get free electricity forever
The only video on RUclips which shows a REAL mercury barometer.
They are not legal to fabricate anymore, I think
Wurtt Mapper yup they aren't cause of mercury as it's really toxic
5 Years later, still the only video
@@vanshajrai6089 yes haha
duhh
I would be a nervous wreck with all those little droplets of mercury laying around.....
Hahahahahahahahahaha
Dime exackty,, moderate exposure could cause mercury poisoning
You can't be serious.
Generations of schoolchildren survived mercury exposure in school labs.
Standard school stuff in the old days.
I've really enjoyed watching this video over and over, again. A Mercury barometer is a real, scientific barometer to me. Always was! :-)
This video worths a "thanks "!
For those who are Interested. You can calculate the pressure from the height of the mercury column, from the given formula:
Pressure = density * gravity.c * height of the column
Mercury is mostly used due to it's high density. Comparing this to water, we would need a column of around 10m.
13.6 m
Is not it supposed to be lower when she used a larger diameter tube?
@@dime3868 no height will be same.. bcz pressure is same n it depends on unit weight and height only
@@Sudhakarsen10 yeah thanks , I was thinking of force and not pressure
@@Sudhakarsen10 whats 13.6?the water ht?
I really love this video
It was so easy to understand this way❤️❤️
Thank you ma'am
(Even though it's been 8 years)
What's significance of naming ur I'd like roll.no. 6!
And is it ur real rollno.!?
Wow, that is a fantastically interesting effect! So it doesn't matter how much mercury you have to begin with in either the tube or the glass, the level always equalizes around the same height in mm. That is really neat.
I built this at my home during middle school using science supply store bought mercury and glass tubes. I also built a working seismometer fitted with real precalibrated pendulums and paper advancement mechanisms around the same time. I thought I was pretty good until I see news of a 16 year old kid building a fusion reactor at home recently 😅
Still the only video that shows real barometer
The mercury barometer is one of the most reliable and accurate types of barometers in measuring atmospheric pressure, but the problem is that it needs a horizontally stable table.
Thanks so much for this video, been struggling to find a real one.
explained it better than anyone imo thank you
Does the crooked barometer have the same amount of mercury in it as the straight one?
Thank you for the experiment just i have a question and i will be so delighted if you answer me , why isnt the size of the tubes important? I think it can change the hight of the mercury.
Pressure= h rho g = height * density of fluid * acceleration due to gravity... In short : pressure is proportional to the height of the fluid column only... Google for more pl
So I conclude that this day the atmospheric pressure was about 988 hPa (14.33 psi) in that laboratory(when the temperature was about 20°C/ 68°F). Slightly lower than usual at about 124m (407 ft) height above sea level
Wow, most informative video found about Barometer
Now if you are active then u are legend 💀
@@rptcreation892 what's up my man
@@yeoyeokinghey, you still there
what if there is no mercury in that little petri dish or the container,would the mercury in the tube fall much further than the 744 m.m??
If the diameter of the tube is small enough, no, because of the surface tension that keeps the meniscus holding the liquid.
No, until and unless there is space to allow air molecules to get in the vaccum made above. It will happen when intermolecular forces are much more to hold the mercury molecules to counterbalance the weight of mercury below the 744 mm. I mean mecruy gets solidified. If it is in liquid then mercury molecules below the 744mm( below thin layer of mercury molecules) aren't capable of holding the weight of mercury below that line.. Then air will suck into the vaccum hehehe
Can any say , how a space got at the top of the tube .The tube was even completely filled
RESHMI R Gravity
That's due to the atmospheric pressure. That area is called Torricellian vaccum
Thank you, Madam. Nicely demonstrated and an informative video
The last part is particularly interesting. 👏👏👏
Thankyou mam, real barometer I see here only
What's with all the mercury being spilled around?
Isn't this a huge contamination issue, or is mercury not that dangerous?
Also, no fume hood?
Obviously, it's cleaned up later. No, no need for fume hood. It's not an acutely poisonous material.
18 flatearthers were butthurt by seeing gas pressure next to a vacuum in this excellent video
Why the level of mercury was same on the thin and thick tubes? Its confusing.
effect of vacuum and atmospheric pressure
Does the same principle work with water but with a much higher height?
FortNikitaBullion 10 m height approximately
10.3 meter
@@daksh0805 How about some other heavy liquid that isn't so toxic? Maybe gallium or even water with some very soluble non-toxic salt?
@@ThePeterDislikeShow Just use the formula 101325 / (9.81 * density_of_fluid [kg/m3] ) = height [m]
Here 101,325 Pa is the atmospheric pressure, and 9.81 m/s/s is the acceleration due to gravity.
@@baileyharrison1030 But even 10m isn't so bad. I'm going to build a barometer with salt water and line it up against the side of my house.
Why does the barometric height remains same even when the shape of tube is changed?
This is known as hydrostatic paradox
Hydrostatic paradox. Google it
@@samuelmallick3778 is it still a paradox? This silly thing
@@catgaming1864 rules are rules...what can i do to change the world ?
?
How many of you can deduce that the lab is at a height more than the standard sea level.
Thanks! Now I know what a mercury barometer is. Was kind of worried for my Geog test earlier on. :)
why does the level not change when you chnge the width and shape of the container ?? Please help
If you look at the formula , atmospheric pressure is equals to height of mercury column multiply by the density of mercury and gravitational field strength , since it does not include the area , the area makes no difference
It is because of something called hydrostatic paradox check it up on Google if you wanna know what it is
Nice demonstration.
The only video I got what I wanted
Thank you for this!
Note the way it is filled ensures that the top of the tube forms a vacuum.
Thank you Ma'am.
May Almighty Allah bless you. AAMEEN
What will happen if the setup is kept in vaccum.
If it will be in vaccum then level of Mercury will drop completely as no atmospheric pressure will me there and only mg will be there which is already same and it wiil be completely poured in beaker
so cool to see this...i am figuring out how to do this with minimum amount of mercury...
I wonder If this lady is OK. That was a lot of mercury. This days some people call firebrigate for broken thermometer. 😮
Thank you mam it was really helpful
Helped a lot!! Thank you 😊
Thank you ma'am ❤
Thanks for it!
Thank you.
who has came here and want to go back for the first point to understand physiological pressure of circulation and mechanics of breathing😅
음 죠아따~!
thank you very much
Tanq ma'am... 😀
Thanks a lot
It's not that easy to clean up, some inevitably gets into cracks or otherwise gets lost. The video demonstrates bad technique.
But good for us
next cool thing would be to show them the partial pressure of water vapour
The money invested in the crooked shaped barometer.
Good job
wow just wat i needed
Thanks
Crystal clear
Sometime I will construct a mecury barometer to calibrate my aneroid barometers to.
Hey Vsauce, Michael here
is this scientist still alive
i hope so
Rip cancer
Excuse me. you didn’t use the significant figures correctly l
After so search I am able to know how it actually works
Nise
Nice
Why cant i understand 😭
There are several ways to explain this phenomenon, & different people have different ways to understand. it might be easier to understand if I used a "J" shaped tube. If I can fill it up while it is horizontal, and then stand it up like a 'J', then the miles of air above the open end are pushing down on the lower part on the 'J', but because the tube is sealed, the air cannot push down at all on the taller side. Only the weight of the extra mercury is pushing down on the tall side.
. This is similar to a see-saw with several hundred loaves of bread stacked high on one side (the air) and only you (the denser Mercury) on the other side to balance the see-saw. If the air pressure drops (fewer loaves), that end rises, and you (on the other side) also drop.
🎉🎉🎉🎉
one cm square area gives one kg force exerted by atmospheric pressures
so one lakh cm square surface gives one lakh kg force exerted by atmospheric pressures
this means only one kilometres squares surface gives 25000 kg force minimum
we can increase surface area by staking and making building
so each story of building gives 25000 kg force exerted by atmospheric pressures
joint force will turned the turbine easily forever since Florida is very stormy area and air pressure always changing
we got powerhouse cheapest way indeed
all Americans are invited to do something about android's barometer at very large scale
one kilometres squares surface barometer sensing device sac cylinders will receive tremendous pressure which can easily push or pulled leverage system and we can produce electricity forever by leverage principles and gearbox based system which turned out turbine and generators setup so we got electricity
in Florida we have very stormy conditions so this type of barometer sensing device turned rapidly and gives many MW electricity per day
whole Florida become a power generators and Americans going to get free electricity forever
surprisingly sloppy technique for a person in a lab coat, just sayin'..., otherwise, great job, thanks
Believe in physics
Vilangichi English akka
Saturn V
I forget 10 to the power of 6 is what prefix.
__ k.k. N
I wish they'd talk in inches. In the 60's they swore that in 10 years everything would be in metric. Still isn't yet, except for these folks.
just tim amp volt watt are metric.
I've got the Mercury, I don't care about amp/watt/or volts, just talk in inch's, please. I want to buy the glass.
inches bad centimeter good
@Ash Singh What the hell is "chad" sounds like bad to me, which it is.
나는 노시훈~~
The only video I got what I wanted
thanks