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- เผยแพร่เมื่อ 6 ก.ค. 2014
- View full lesson: ed.ted.com/lessons/how-heavy-i...
Too often we think of air as empty space - but compared to a vacuum, air is actually pretty heavy. So, just how heavy is it? And if it's so heavy, why doesn't it crush us? Dan Quinn describes the fundamentals of air pressure and explains how it affects our bodies, the weather and the universe at large.
Lesson by Dan Quinn, animation by Sandro Katamashvili.
For all the people complaining about her use of the word "Fluid," I'd like to point out that Fluid =/= Liquid.
Gases and Liquids are BOTH fluid phases of matter.
Well said BeeGeenie . Sometimes people use "fluid" informally to mean "liquid", as in, "don't forget to check your car's fluids" and "drink plenty of fluids", but in the physics community, "fluid" means any substance that deforms continuously under shear stress, including both liquids and gases. So air, water, blood, oils, carbon dioxide, etc. - these are all fluids at room temperature.
+Jeffry Maiato Yes you're right - solids deform under normal stress (stress and strain in same direction), and some solids deform under shear stress (stress and strain perpendicular). But eventually internal stresses will balance the imposed stresses, and the solid will stop deforming. Only fluids deform continuously under shear stress, that is, they continue to deform so long as the stress is imposed.
lol wut people are actually complaining about that? Did they go to school?
what flows is fluid
like cum
Plot twist: The elephant in the room is actually made of air.
Thats the point?? It represents the weight of the air in the room
Xoran lol
@@kurobiten It’s a sarcastic remark, the elephant in the room or the important topic is air (and it’s *weight*)
@@kurobiten r/wooosh
U mean the elephant in the gym
And now my breathing is on manual, dammit!
erasmusso same
same
when she said take a deep breath, i took a deep breath, but i didn’t breathe out because the illustration showed a swarm flying into my lungs and i guess my brain was like “you’re not going to breathe anymore”
Same
erasmusso aaaaaannd now im blinking manually.
And so are you
“From the moment you got out of bed to the moment you sat down to watch this video”
Joke’s on you, I’m still in bed.
“when you’ve gotten out of bed to watch this video”
stop right there. i haven’t gotten out of bed yet.
That means we're all airbenders! XD
Käsekuchen Glasur no its just the air helps us to breath properly
You must be really fun in parties...
woosh
"The last airbender" is a LIE. A *LIE*.
Proof of God's amazing creature :Air
"The vastness of the universe is right in front of you, and inside you." I love it.
deep
That ending. 2deep
Jordan Reeves that was awesome, thanks!
That’s ending led me into the deepest and most mysterious places in my dreams.
How do you have a photo of Kim Jong Un with make up on as a profile picture I've never seen that
"the vastness of the universe is right in front of you, and inside you." that's a pretty heavy quote, heavier than air
Very interesting lesson, never thought of air that way, thanks
I still don’t know how tall air is
0:08 Joke's on them, I haven't gotten out of bed yet
Because the question wasn't actually answered in the video, I'll do it now (Scroll to the bottom if you don't want to see the calculation).
Relative molecular mass (Mr) of nitrogen is 28. Mr of oxygen is 32 (double the relative atomic mass as they go round in pairs).
Assuming the atmosphere is made of 79% nitrogen and 21% oxygen, we can say that the average Mr of molecules in air is:
(0.79 x 28) + (0.21 x 32) = 28.84
Moles = volume (in dm^3)/24
Using this equation if the volume is 1 m^3 then the moles would be 1000/24 which is 41.667 moles of air.
Mass = moles x Mr
Using this formula we can say in one metre cubed of air there is 41.667 x 28.84 = 1202g
So every cubic metre of air has a mass of 1.2kg (at room temperature and pressure - RTP) ... I think
In non-metric (American) layman's terms, I think I recall that it's approximately 15 lbs. per square inch, at sea level. I don't know if that jibes with your metric calculations.
1 atm (1 atmosphere of pressure) is about 101 kPa (kilopascals) and a Pascal is an SI unit so therefore can easily be converted to kilograms. One Pascal is equal to one Newton per square meter. If there's 101325 Newtons per square meter then per square meter there is 101325 kg * m/s^2 or under our own gravity would be divided by 9.81 m/s^2 which is roughly 10329 kgf (kilogram force) per square meter. Per square decimeter would just be that divided by 10 twice (or 10^2) which would be about 103 kgf per square decimeter. Divide by 10 twice again and you can get 1.03 kgf per square centimeter.
In other words you feel about 1 kg pushed on every square centimeter of your body.
This is absolutely amazing as every TED-Ed lesson. This is how teaching should be! :) However, I believe the elephant-gym example can confuse students, as the air pressure in an actual room is atmospheric pressure, so it is like having 10 tons (two elephants) each single square meter. Although it might be a difficult concept for educational videos, I think we should try to explain students that pressure is not about weight, but about molecular density and velocity... Anyway, awesome video :)
By far one of the best clips by TED!
10 billion insects, Geez I bet 90% of them are mosquitoes.
they said Quintilian.
So we have thousand then million then billion then trillion then quadrillion then Quintilian
so if everyone on earth split up the bugs on earth evenly we would each have about as many bugs as people who live on the earth.(or something like that)
There are about 7 billion people on Earth. That means that there are more insects than every human alive.
Jebron Lames
You're wrong
Though this is a joke, mosquitoes make up a small portion of the bug population
the Smithsonian Institute states, "The largest numbers of described species in the U.S. fall into four insect Orders: Coleoptera (beetles) at 23,700, Diptera (flies) at 19,600, Hymenoptera (ants, bees, wasps) at 17,500, and Lepidoptera (moths and butterflies) at 11,500," meaning that beetles and flies make up a much larger chunk of the population.
It also isnt 10 billion, it's 10 quintillion (10,000,000,000,000,000,000)
@@kkknotcool You misspelled quintillion. Just to notify you.
It's so deep, that the pressure is killing me.
thank you… love Ted-Ed… look forward to each one, everyday… I repost each and almost every one… keep up your superb work!
Super great.
Thanks for posting this.
Haaha who gets out of bed these days?
appoNo1 ikr, especially NOW lmao
Vivian Ingram
That was 5 years ago...
THIS COMMENT WAS WAYYY AHEAD OF ITS TIME U GUYS.
keesha badani
ok.
not like it didn’t happen before
Its 2020..
So, air = The Force?
It surrounds us, penetrates us, it binds the universe together.
IT PENETRATES ME SO HARD
shu-fang wang Luke use the force is a sentence from star wars
shu-fang wang
Huh
That just made me feel stronger:)
I keep seeing comments like "air is a gas, so it can't be a fluid."
*Face palm*
*Face palm*
*Face palm*
Even I learned all about this back in middle school physics -.- These are the basics.
Excellent video. Thanks.
Absolutely brilliant!
Beautiful animation style.
I love all of Ted Ed's videos above all edu vids on TH-cam, truly
For everyone who would say that would like to have super speed for a power, depending on that speed. Air can practically become the density of water or sand.
The animation is amazing .
Very Nice.
Thanks, Jeffery Williams! We hope you'll stop by again. :)
Are you kidding? TED-Ed is a daily (or however often you publish) stop. I watch nearly NO tv any longer. Your channel, SciShow, SourceFed... things along those lines
Jeffery Williams i like defranco, and soucefed, but they are losing touch, and starting to be as opinionated as 24 hour news....
SourceFED is beginning to loose something your right. I was not sure what that something is but your right something is off. SciShow also now that Hank is to busy to do every episode has lost a little something but is still very good. TED Channels are always great and hope they don't go the way of some other channels.
Brian b I watch both of those and agreed. Checkout buzz60, scishow, I'll give some others as well.
Wonderful video!
The video starts with "from the moment you got out of bed today to the point you set down to watch this video".
Who said it happened in that order?
A very short video that is densely (pun) packed with knowledge.
brilliant!
The title question was : how heavy is air?
Did the video actually answer its own question?
They gave the weight of air in a gymnasium. Which is 1 elephant
Amazing video, again
Cool! Great video!
plot twist: there was always a monster under your bed
Did the video answer the question of how heavy the air (say in a finite container) is? Did I miss it somewhere? And where does this conclusion about the air molecules surrounding us is greater than the total number of grains of sands + the stars in the visible universe? These sounds like at worst hyperbole or at best a crude guess without much support in the video.
Thanks for the healthy skepticism plartoo :) Every cubic meter of air weighs about 12N at sea level, so for the school gym estimate, we used 25m*15m*10m*12N/m^3 to get 45kN, a typical weight for an adult elephant.
Estimating the grains of sand vs. stars in the universe is far more challenging, and has become a classic estimation challenge for amateur and professional scientists. I've seen estimates for the sand ranging from 10^19 to 10^24, and estimates for stars in the 10^23-10^24 range. The fact that the magnitudes are similar has led to all the debates - Google "sand grains or stars" to see what I mean. But the number of air molecules in, say, a school gym is closer to 10^29, which exceeds the other two by several orders of magnitude. Of course, these are all estimates, but we made the comparison confidently because the numbers aren't even in the same ballpark.
Thanks for taking time to write a response, ***** :) Now I understand the context you measured the weight of the air: it is the weight of the air in a typical school gym. Also, I understand now that you estimated the air molecules that are enclosed in the gym to compare against the observable stars + grains of sands. That makes everything more concrete and clearer. Thanks again.
***** Thank you for your answer in the comments section. Now I know. Excellent video.
0:34
ขอบคุณมากๆครับ สำหรับการบรรยาย ไทย
Really interesting! nicely presented,nice animation!
My dad taught me this when I was little, about Bora, the wind from croatia's mountains
The study of air/gas movement and pressure is in the realm of Fluid Dynamics.
Thanks
carl sagan quote at the end there? i like it.
Mind Blown
Is the woman that narrates this nasally or is it just me? :P
Who else is watching this in bed and is like 'ill go swimming later in the air'
who else has been set to watch this from school cause your in self isolattion
Wow, how did ted ed know that I’ve been swimming today, I’m literally watching this with my hair in a towel
The pressure of air is equal to the weight of a column of air extending upwards to space, but widening towards the top such that the sides of the column are exactly vertical.
This video is rad
2:15 - 2:18 boi
2:33, I took a deep breath
at the last part my mind has been blown
I felt like I couldn’t breath this whole video
Good!
Standard atmospheric pressure is 14.696 psi at sea level.
That is the mean average, at a standard temperature, so in other areas of sea level it can differ.
Interestingly 14.7:1 is also the stoichiometric air-fuel ratio that gasoline combustion engines use at sea level.
if Air is a fluid, is plasma a fluid? and if there is plasma, then is there an opposite to it? like something so cold that it changes its form of solid, into something else? I would like to know.
that last sentence tho
Tell me i'm not the only one who woke up and then watched the video on laptop while still in bed
how the air pressure can be calculated in a vortex ring of vortex cannon generated by explosive?
What makes you think I got out of bed before I watched this video?
Did anyone else think that the title was how heavy is hair?
10:39
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INSIDER
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the vastness of the universe is right in front of us, and inside us. very deep frase
some videos say the force of 'dark energy' total in the universe is 1 x 10^9 than all molecules in it
That is some deep shit bro.
Does this mean that we're all airbenders
awsome
Damn our bodies are awesome
My experience with scuba diving is that a filled cylinder is always heavier than one that is low on air
Thanks for making me aware of my breathing..... again....
I dony need to study if i can watch all of this videos!
Ou should have talked more about vacuum and pressure, that would gave been a lot more shocking and mesmerising
thats one big fish @ 2:22
I haven’t left my bed yet
How did you know i had a pool in my bedroom?
Darth Vader: *breath in*.......*breath out*.......you don’t know the power, of the air
If this is the first time hearing anything like this, the last 30 seconds will hit you like a brick.
This video somehow clears out that Fluid are no all Liquid. It may be confusing at first since we seldom use fluid to name a liquid like "Brake Fluid" or "Lighter Fluid". Fluid means free flow, can't believe I forgot what I leaned in Science Class.
Did I miss the part, where you actually answered the question in the title?
1:10
The title of the video is "how heavy is air?".
After watching the video, I still dont how heavy air is.
It's not specific but 1:10 has an answer.
I watched this video to learn "how heavy is air". How come video does not answer the question in the title?
Anyone else take a nice deep breath?
What if I stayed in bed until I watched this video? 😛
2:37 did anyone else start breathing heaps, waving your hands around the air and saying things like "I command you to move!!!" ? Anyone? No?
Was it too hard to say "1,225 kg/m^3 @ sea level and 15°C"? Kidding, nice video.
SOO DEEP
Wow 😯!
Is the air pushing down or is gravity pulling the air down and/or keeping it relative in it's space? Lastly, why didn't the narrator blow her nose before doing this??
رائع ♥
So technically I'm an airbender.
Every time you inhale, atoms from farts of almost every person who has ever lived, enter your lungs.
I have been summoned here by the cult leader of the Rolli.
I reported this in the classroom and they are stun.
I wouldn't call walking in the bottom of a pool "swimming"
Depends on the book
*a gazillion years later*
_WE’LL ALL TURN INTO MINI-SUNS_
Dan Quinn? Coach of the Atlanta falcons?
so how heavy is it?
My teacher told us that if you cant personally feel it, it has no weight.
I wanted to question her badly...
Exactly what i told my friend
Tell her to breath in, after allowing her chest to open up to increase the volume of her lungs, forcing outside air to equalize the lower pressure in her lungs, you may inform her that she has just felt the the weight of air.