The history of the barometer (and how it works) - Asaf Bar-Yosef

[@Tombee2]

2:41 instead of a light bulb there is a candle which is historically accurate.

[@FluodioCin]

=)))))

[@booklover-hu9tw]

😂😂😂

[@Fulikia]

damn didnt realized that

[@shashikalaraju5769]

bulls eye.

[@aninditamukherjee8149]

True!

[@GuillotinedChemistry]

This is definitely one the best video I've found on barometers. Really nice job on explaining misconceptions about vacuums.

[@huzaifaarshadabbasi8744]

👍🏻

[@Sevalithi]

Oh these little scientist dudes are so cute!

[@satire9298]

No homo?

[@Sevalithi]

He feels like he needs a disclaimer whenever he compliments guys. Probably because he's not secure in his own sexuality.

[@marafradella2712]

Thank you!

[@intelX1000]

Kyle Sanchez This is what's called 'projecting'. You always check if your projection is correct before stating it, or you'll look like Kyle, the liberal.

[@timlang3852]

Kyle Sanchez o

[@MalaysianTropikfusion]

I have to say, the characters in this animation are the cutest I've seen so far. Love it!

[@amyannaroy8357]

good job with the graphics and explanation....

[@boy.interlinked]

So weird, I actually have 2 notifications right now.

[@farzanaqalandari5615]

Pop

[@kilney2418]

Evangelista torricelli

[@MelihCANBOLAT]

3:23 The height should be measured from the surface of the liquid

[@Simon-mr6zy]

yes!

[@harsh2032]

good eyes sire!

[@terenceting26]

I had that question, thanks for confirming. Ted-ed should at least pin this comment. The graphical designers might not understand this.

[@eljison]

Not necessarily. You just need to measure the change in height from any known reference point. If you start with liquid (water or mercury) in the tube, you can make that the zero and calibrate it whatever pressure you want (1 atm, for example), then measure the height relative to that reference point.

[@hassaan1670]

thanks, i was wondering

[@raniahussein7002]

I am from iraq,,,,I like this way to understand information in study,,,,,,great video

[@atiqueahmad3058]

Rania Hussein o

[@moej3386]

@@PhartingFeeting exactly-

[@xOxAdnanxOx]

Moe J what made you’ll go uncomfortable with it? lol

[@KaramYagan]

@@xOxAdnanxOx Chill. They are just pointing out that it is incorrect to use them this way. She should have put dots instead of commas, but.... Mehhh

[@twitwilight6087]

Hi Rania I'm pretty sure that you were in your first year in high school and having a trouble with studying physics and barometer when you wrote this comment, the same thing is happening 😂😂💔

[@ssathe8273]

"Until necessity raised the issue " : such a deep and wonderful quote ❤️❤️

[@kirstenkoch5920]

By far the best and simplest explanation I've seen. Good job with the graphics too!

[@shamunhaider2793]

yeah

[@davidbooth3285]

Loved the way Torricelli had his lightbulb moment with a candle!!

[@jp4431]

So much knowledge we take for granted today were such brilliant discoveries back then

[@ChanchalKotal]

This is my favorite channel so far because of the explanation and animation of each video. They are too good! Thank you Ted-Ed!

[@meghanakankara2883]

Thanks for this video. I have been suffering to understand this concept but none was working but now this video with the explanation of the barometer and its history with splendid animation have helped not only me but many other students to understand the complexity and art of learning science. Thank you!

[@smitasuhas7981]

I have experimented this with mug in bath tub (Some Indians can relate)

[@a.kzestos2085]

True

[@yashrathi6862]

the height of the water level at ground level is close to 9 meters, you can't do it with a mug unless you do it on high terrain.

[@shaunakn5881]

True lol

[@askhfbfns67589]

not Indian but i can relaten lol

[@RandomDudes710]

I think that's what we call a faulty barometer or just not a barometer at all

[@AbidHasan-tg7jo]

3:23 the 76 cm height should be measured from the surface of the water.

[@STAR.C455]

I’m a little princess 👸

[@STAR.C455]

Hi

[@wonderman8537]

Bye

[@Sama-pl2pz]

Ya... Good observation🤝

[@Gojoft.sukuna]

True

[@abdulmalikalghazali8241]

I like the way how you make it easy to understand by making it enjoyable

[@alligrim]

Ted Ed saves my butt in my chem honors class every unit.

[@Blarmy_Korea]

Totally helpful! I was confused abt the barometer but saw this video and understood everything.. Thank you

[@boofang10]

EXCELLENT video on the background of the barometer, especially the mercury barometer

[@kokioto420]

I'm so thankful Ted Ed had a video on this, I needed this for my homework and this makes my homework more fun!

[@garydunken7934]

As usual, nice one TED! My 3 observations in this video: 1. At 1:34 Gasparo Berti pulled his idea from his arse, literally! Thanks for the funny animation. 2. Both Aristotle and Galileo behaved like jerks with regards to their knowledge of vacuum, albeit being good in other areas. 3. How brilliant both Gasparo Berti and Evangelista Torricelli were, for thinking outside the box (or tube like you mentioned in the video!)

[@PhysicsVlogs]

hahah u're right..

[@crashsitetube]

People also had a lot shorter legs back then. Between the Rubenesque women and short-legged men, it''s a wonder the human race has survived. But, enough inane silliness. Really good video. Thanks.

[@anugopan5]

CORRECT

[@dhanyak.j9618]

Awesome 😊😁😊😁😁😁😁😊😁😊😊😊👍

[@dhanyak.j9618]

Good morning. Good night. Good for the video 👍

[@michaela9914]

Lovely explanation

[@drlefebvre8489]

Michaela what is mmhg

[@zaoshmakujina2215]

This cleared my doubts which arised in the chapter Mechanical properties of fluids thank u

[@superrandomuser]

same

[@urvijain2823]

2:59 - I have a question here : If you change the amount of water in the tube will the water still drop to 10.3 m? Amazing video btw, my teacher brought me here and I understood the concept of barometers so much better after watching this :D

[@SydneyMadueke]

Yup it should. For example, if you repeated the experiment but with a 100meter tube, the water pressure in the tube is far greater than the surrounding atmospheric pressure so it would force the water out until the water pressure and atmospheric pressure are equal which would be when there is only 10.3 meters of water left in the tube. Correct me if I'm wrong KZbin

[@tiaxanderson9725]

Yes, it's the weight of the atmosphere that's 'pushing down' on the water and thus 'forcing it up the tube'. So even if you made a tube 1000 meters tall, all the water would spill out until it reaches 10.3m as 10.3m of water equals 1 standard atmospheric pressure. It's also why the mercury barometer is only 0.76 m tall as mercury is much heavier than water. (so 0.76 m mercury = 10.3 m water = 1 atm)

[@tejasnimbkar694]

TED-ED team can you also make a you-tube video on Calculus Just beginning of it. It would be great

[@briangardiner7574]

Use this video every year. Thank you

[@twitwilight6087]

I'm from iraq , this way of learning is amazing 💗

[@DivineAgility]

رابع علمي؟

[@twitwilight6087]

@@DivineAgility اي

[@DivineAgility]

@@twitwilight6087 عاش اني هم

[@twitwilight6087]

@@DivineAgility الفيزيا ضيم مو ؟

[@kaushikpawar7508]

Amazing work team💯

[@MuhammadIqbal-dy5ks]

Nice way of teaching 😊😊

[@MuhammadIqbal-dy5ks]

Good

[@jeremiahyolok6663]

very good and clearly explained

[@billchoi2000lsc]

I love stories about challenging pre-existing theory and making major scientific breakthrough!!

[@tueanhvu1627]

I can't understand the experiment until this. Thanks =)))

[@chow143]

Extremely helpful

[@FailCant]

Truly fascinating

[@yashchaudhary9596]

I understood the concept of barometer bec of your video. THANKS

[@malv4935]

This is awesome and so adorable, thank you :D

[@russel4942]

This really helps a lot and well-explained compared in schools

[@josephcalabrese6337]

I'm watching this video because my new digital watch has a Barometer App. Knowledge is power.

[@melashop669]

el vídeo que necesitaba ver, muchas gracias

[@naitikarora1694]

This helped me a lot... Thank you soo much

[@93mrravi]

Beautiful explanation!

[@manallarrehemi5838]

I totally agree that the thinking outside the box " the tube " is always the right way to find solutions , even if the others do not agree with you THANKS FOR THIS VIDEO 🥰

[@priyalks1614]

its so so so lively and understandable pls try your luck in many more topics

[@godfreyxbrown1393]

Great explanation 🎉🎉🎉

[@abderrahimelboutaybi9018]

Thank you. Very clear and great explanation.

[@maulikshah28]

Great video, helped me understand the topic really well

[@popogast]

Nice and descriptive explanation.Well done.

[@duckiie15]

Beautiful execution👏

[@priyankabhardwaj4590]

ted ed is the best!

[@memo6032]

3:33 I don't know if sb wondered about this or not but the reason why increasing the volume of water didn't affect the pressure of the it and it didn't need to go lower in the tube to be in equilibrium with the pressure outside the tube is because pressure of liquids only depends on their *density, height and gravitational field strength*. So since the two tubes are the same height, and the gravitational field strength didn't change and we are using water in both tubes (density of fluid didn't change) it doesn't matter. This may seem like it doesn't make sense but you can google to see the proof of it. And if you still don't understand, it's okay, if I wasn't taking phyiscs this year I wouldn't have understood either 😂😂😂

[@piggyparadiseplayz395]

This is a great video! thanks for the information!

[@sayemshahariaprethebe]

Thank you so much

[@yenlingleong]

Very nice! I've a question, at 3:22 , for the height of the mercury column (76 cm), is it measured from the base of the container or from the surface of the mercury in the container?

[@henhaliusaz5984]

It's measured from the surface of the mercury. By the way, if you put the tube deeper into the container, the volume of the vacuum would decrease, and vice versa.

[@MukeshKumar-zv1wk]

fantastic way to learn

[@hemanjalihemanjali2896]

nice to understand easily

[@vijaychandra8550]

Thanks TED...nice explanation ever

[@hannahhoag8571]

This is fascinating!

[@ashenudayanga6359]

Thanks bro...... before i see this video, i have no idea about this exeriment.

[@Shinywhite]

Very good explanation, tyvm.

[@shaziajehanzaib941]

Awesome animation and explanation

[@novakrypton5841]

I have a question.....if we put the barometer in a non inertial frame with constant acceleration upawards....will the level of mercury change due to pseudo force??

[@analinagarcia]

Such a great video. Thank you.

[@novachan69]

Thanks dude u cleared my doubts

[@unskilled_i_guess]

this helped so much

[@gurbakshkaur1213]

Its very helpful.😊

[@andrewwarren3633]

There is a mistake at (or near) the 3:22) mark in the video. The dimension should be from the top of the pool of mercury, not the bottom.

[@Soneoak]

A vacuum exerts no force. It is the surrounding pressures that pushes the fluid into the tube to collapse the vacuum, and the weight of the fluid that establishes an equilibrium. The classic barometer is therefore a device that uses the weight(and hence pressure exerted by it) of a fluid to measure the opposing surrounding air pressure against it. As proper scientists, we always evaluate how our models would simulate the real world, and not the other way round. The world exists as it is. We merely describe it, not prescribe it. We propose models, then test them. Untested models are merely that, hypothesis, nothing more, but nevertheless, intrinsically valuable.

[@prashant.timilsina]

always such a wholesome videos✨

[@VVVV11995]

HOW INTERESTING! THANK YOU

[@Evan_Adams]

So.... what happened after 2007? How do we do it now?

[@stephensnell5707]

If you aren't aware Aneroid Barometers are now used and will be forever

[@nileshvishvambhar6780]

It was Best explanation... Thankyou

[@vanshikha7179]

amazingly explained!

[@JoejoeReference]

"Fortunately, he turned out to be wrong" A phrase commonly heard when Aristotle is brought up

[@PhilippKirchner]

Well made, and such nice animations ^-^

[@marafradella2712]

Thank you Philipp!

[@alyssatiangco7110]

thanks for helping me with my homework lol i knew nothing before this video

[@muhittinselcukgoksu1327]

the other TED videos are not so ..They are very well.

[@ketfoen]

Thinking outside the box, I'm glad we have had people like that in the past. We have them today as well, but with so many public trolls around they don't get the chance to even speak.

[@jchae9820]

thanks sir!! very useful actually

[@VyvienneEaux]

I really enjoy Toricelli and his result.

[@31896eneri]

Great story!

[@PeteGravell]

Nice video. But there is a small amount of mercury vapor in the space above the mercury, so it's not a perfect vacuum, and it does not prove Aristotle wrong. According to Wikipedia the vapor pressure of mercury at room temperature is about 1Pa.

[@Abdullahss1]

Pete Gravell i don't think that there is a mercury vapor in all cases

[@boeman6702]

Pete Gravell Aristotle was wrong in atomic scale as well...

[@ytfrgaming632]

Amazing 😍😍😍

[@Peppermint1]

Worth mentioning that most times bad weather does not cause barometer drop. Small systems bring rain/snow without a drop in atmospheric pressure, actually sometimes the pressure may even increase. Mostly the large systems will cause a pressure drop. In other words., most of the time these barometers are worthless.

[@salmamuhamed5728]

Great in a cute way. Love it. 👍

[@awasthiatul51]

thank you.. very nice exlanation

[@vinitaugaonkar4683]

it was fun and learned easily

[@pranshgupta4826]

Thank you I don't know much about vacuum but it did help me with atmospheric pressure so thanks..a lot!!..

[@rawanreda6908]

That was really good !!

[@patriciayokelin9382]

I love the graphics of this video, the scientists are so cute!

[@pcg259]

This vacuum is the void of matter but it is filled with a liquid more mysterious than anything mankind has ever tried to understand.

[@n8mail76]

thanks. must of us have only memorized these concepts taught to us. learning the mechanics behind how and why the concepts were developed bring a deeper understanding of the concepts.

[@mahmoudashraf117]

not avacuum there is vapour pressure there but in minimum value so can be neglected without much error

[@josyulasanshray2936]

@Rocket Man on Suicidal Mission Yep there are only partial vacuums with very few particles per unit volume

[@janvigupta558]

Thanku so much this is really helpful🤗

[@Pineapple_extract]

Great explaination

[@georgekalemis7359]

Very nice video. Is there a way to contribute Greek subtitles?

[@princessminnis-moss491]

verry helpful for my baby social studies

[@baharosman1416]

Thank you!!❤️❤️❤️

[@ceff01]

These are on planes for decision height altitude for anp/rnp landings in low visibility around mountainous areas

[@sweetnasa1]

And that's also the reason "measuring units" of "pressure" is Torr or Pascal credited to the two celebrated scientists who helped us discover about Air Pressure. :)

[@成如]

I got this question in my book, "what would happen if the barometer were taken up a high mountain?" So, the answers to this question would be, "because the atmospheric pressure dropped decreased with altitude"?