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- เผยแพร่เมื่อ 5 ก.พ. 2025
- View full lesson: ed.ted.com/less...
A barometer is an instrument that measures air pressure, allowing weather forecasters and scientists to better predict extreme weather events. Despite its incredible usefulness, inventing the barometer was no walk in the park. Asaf Bar-Yosef describes the series of scientists and events that contributed to the birth of the barometer -- and explains how it actually works.
Lesson by Asaf Bar-Yosef, animation by Reflective Films.
This is definitely one the best video I've found on barometers. Really nice job on explaining misconceptions about vacuums.
👍🏻
2:41 instead of a light bulb there is a candle which is historically accurate.
=)))))
😂😂😂
damn didnt realized that
bulls eye.
True!
Oh these little scientist dudes are so cute!
No homo?
He feels like he needs a disclaimer whenever he compliments guys. Probably because he's not secure in his own sexuality.
Thank you!
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.
Kyle Sanchez o
I have to say, the characters in this animation are the cutest I've seen so far. Love it!
By far the best and simplest explanation I've seen. Good job with the graphics too!
yeah
I am from iraq,,,,I like this way to understand information in study,,,,,,great video
Rania Hussein o
@@PhartingFeeting exactly-
Moe J what made you’ll go uncomfortable with it? lol
@@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
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 😂😂💔
good job with the graphics and explanation....
So weird, I actually have 2 notifications right now.
Pop
Evangelista torricelli
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!
I have experimented this with mug in bath tub (Some Indians can relate)
True
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.
True lol
not Indian but i can relaten lol
I think that's what we call a faulty barometer or just not a barometer at all
This is my favorite channel so far because of the explanation and animation of each video. They are too good! Thank you Ted-Ed!
"Until necessity raised the issue " : such a deep and wonderful quote ❤️❤️
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!)
hahah u're right..
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.
CORRECT
Awesome 😊😁😊😁😁😁😁😊😁😊😊😊👍
Good morning. Good night. Good for the video 👍
3:23 The height should be measured from the surface of the liquid
yes!
good eyes sire!
I had that question, thanks for confirming. Ted-ed should at least pin this comment. The graphical designers might not understand this.
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.
thanks, i was wondering
So much knowledge we take for granted today were such brilliant discoveries back then
Loved the way Torricelli had his lightbulb moment with a candle!!
I'm so thankful Ted Ed had a video on this, I needed this for my homework and this makes my homework more fun!
Totally helpful! I was confused abt the barometer but saw this video and understood everything.. Thank you
I like the way how you make it easy to understand by making it enjoyable
Ted Ed saves my butt in my chem honors class every unit.
This cleared my doubts which arised in the chapter Mechanical properties of fluids thank u
same
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 🥰
EXCELLENT video on the background of the barometer, especially the mercury barometer
Nice way of teaching 😊😊
Good
I'm watching this video because my new digital watch has a Barometer App.
Knowledge is power.
Use this video every year. Thank you
Lovely explanation
Michaela what is mmhg
@@drlefebvre8489 millimeters of Mercury
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
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 TH-cam
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)
I'm from iraq , this way of learning is amazing 💗
رابع علمي؟
@@DivineAgility اي
@@twitwilight6087 عاش اني هم
@@DivineAgility الفيزيا ضيم مو ؟
I love stories about challenging pre-existing theory and making major scientific breakthrough!!
TED-ED team can you also make a you-tube video on Calculus
Just beginning of it. It would be great
I can't understand the experiment until this. Thanks =)))
"Fortunately, he turned out to be wrong"
A phrase commonly heard when Aristotle is brought up
I understood the concept of barometer bec of your video. THANKS
3:23 the 76 cm height should be measured from the surface of the water.
I’m a little princess 👸
Hi
Bye
Ya... Good observation🤝
True
Scientists: Think outside the box
Me: Hmm... Where is the box??
@AR7UN FF people nowadays tend to try to find something creative, but most of them dont really understand things in the box in detail
This is awesome and so adorable, thank you :D
Amazing work team💯
thanks for helping me with my homework lol i knew nothing before this video
very good and clearly explained
nice to understand easily
Truly fascinating
This really helps a lot and well-explained compared in schools
Great explanation 🎉🎉🎉
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.
its so so so lively and understandable
pls try your luck in many more topics
Great video, helped me understand the topic really well
fantastic way to learn
the other TED videos are not so ..They are very well.
I love the graphics of this video, the scientists are so cute!
ted ed is the best!
Thank you so much
el vídeo que necesitaba ver, muchas gracias
This helped me a lot... Thank you soo much
Extremely helpful
HOW INTERESTING! THANK YOU
It seems to me that,
I also was the part of experiment.
Nice way to explain 🙏🙏👏👏
Very good explanation, tyvm.
Thanks bro...... before i see this video, i have no idea about this exeriment.
I really enjoy Toricelli and his result.
thank you.. very nice exlanation
Thank you. Very clear and great explanation.
Its very helpful.😊
Thanks dude u cleared my doubts
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.
verry helpful for my baby social studies
this helped so much
Great in a cute way. Love it. 👍
It was Best explanation...
Thankyou
This is a great video! thanks for the information!
Beautiful explanation!
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.
Thank you!!❤️❤️❤️
I learned more from this video, than from my science highschool book
it was fun and learned easily
Thanks TED...nice explanation ever
Thank you I don't know much about vacuum but it did help me with atmospheric pressure so thanks..a lot!!..
This vacuum is the void of matter but it is filled with a liquid more mysterious than anything mankind has ever tried to understand.
thanks sir!! very useful actually
Great story!
always such a wholesome videos✨
Amazing 😍😍😍
Well made, and such nice animations ^-^
Thank you Philipp!
Legends are watching in 2021 !
Great video. What is your reference?
Thanku so much this is really helpful🤗
Nice and descriptive explanation.Well done.
Great explaination
Such a great video. Thank you.
Beautiful execution👏
These are on planes for decision height altitude for anp/rnp landings in low visibility around mountainous areas
This is fascinating!
Awesome animation and explanation
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??
The animation is so cute ♡
Wish the real-life scientists were as cute.. ♡
That was really good !!
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.
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.
Pete Gravell i don't think that there is a mercury vapor in all cases
Pete Gravell
Aristotle was wrong in atomic scale as well...
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 😂😂😂
Tysm ❤
Thanks so much❤