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.
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”
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 :)
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.
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.
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)
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)
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.
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.
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.
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
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.
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.
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.
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.
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??
ok, so we know that atmospheric pressure and internal pressure are the same and this is what helps us survive...so we know how it works, but why does it work that way? Why is it that perfect? I want to know why and not how!
Evolution. The beings that were not born this way died (exploded or imploded) in the begining of life. Actually, the balance don't need to be 'perfect', just enough to not explode us. Our lungs, when we fill them and stop breathing, the pressure inside is greater than outside, but we don't explode.
MuzzaFuzza If you mean the story of a giant bearded man in the sky, a talking snake, a magic apple, two naked people and an enchanted garden vs. years of scientific evidence ( look up what scientific theory means) you are either ignorant willfully or just so blinded by faith that you can't accept anything other than your own fantasy
MuzzaFuzza In scientific environment, theory is a word very different from what we use daily. hypothesis is something that someone told and nobody have any evidence (is what we call daily 'theory'). In science, theory is something with a lot of evidence ('proofs') that explains how something work. One evidence of evolution is virus. It's DNA changes every year, that's why we have to take the vaccine. Or the bacterias, when you take antibiotics not until the end of threatment, you select the best bacteria (without cleaning your body), so, it will reproduce, and this new kind of bacteria is immune to the antibiotic that you took. That's the theory of evolution. A logic explanation, based on mutation (we can see in microscope), natural selection (we can see hapening in nature) and heritage of DNA (we can see in genetics). P.S: Sorry for my bad english, is not my native language =//
1:22 "because most of it is pressing on the floor and the walls" It's these kind of statements that make me believe that the videos are written by someone non-scientific. It would be hard to classify such a claim as either false or true. Better to say it's "not even wrong". Importantly, it doesn't represent any physically meaningful concept and explains nothing. You can select any quantity of surface area within that gym and get another meaningless number. It has nothing to do with why air doesn't crush us.
I don’t know if it’s just me but I think I can see air. If you stare at a white wall for a couple seconds your gonna see very little tiny compacted dots and it looks like it’s moving 🤭
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
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
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
@@Blurrlp It’s a sarcastic remark, the elephant in the room or the important topic is air (and it’s *weight*)
@@Blurrlp r/wooosh
U mean the elephant in the gym
“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.
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
“when you’ve gotten out of bed to watch this video”
stop right there. i haven’t gotten out of bed yet.
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
"The vastness of the universe is right in front of you, and inside you." I love it.
deep
Very interesting lesson, never thought of air that way, thanks
I still don’t know how tall air is
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 :)
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.
0:08 Joke's on them, I haven't gotten out of bed yet
By far one of the best clips by TED!
thank you… love Ted-Ed… look forward to each one, everyday… I repost each and almost every one… keep up your superb work!
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
I love all of Ted Ed's videos above all edu vids on RUclips, truly
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..
The animation is amazing .
That just made me feel stronger:)
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.
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.
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
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.
Beautiful animation style.
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.
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
plot twist: there was always a monster under your bed
My dad taught me this when I was little, about Bora, the wind from croatia's mountains
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.
Is the woman that narrates this nasally or is it just me? :P
ขอบคุณมากๆครับ สำหรับการบรรยาย ไทย
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.
Super great.
Thanks for posting this.
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?
The study of air/gas movement and pressure is in the realm of Fluid Dynamics.
carl sagan quote at the end there? i like it.
Excellent video. Thanks.
A very short video that is densely (pun) packed with knowledge.
Thanks
10:39
Why 'Bohemian Rhapsody' Is The Best Song Ever Written
INSIDER
Recommended for you
who else has been set to watch this from school cause your in self isolattion
Amazing video, again
Wonderful video!
at the last part my mind has been blown
Wow, how did ted ed know that I’ve been swimming today, I’m literally watching this with my hair in a towel
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.
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.
some videos say the force of 'dark energy' total in the universe is 1 x 10^9 than all molecules in it
This video is rad
2:15 - 2:18 boi
What makes you think I got out of bed before I watched this video?
the vastness of the universe is right in front of us, and inside us. very deep frase
Who else is watching this in bed and is like 'ill go swimming later in the air'
Did anyone else think that the title was how heavy is hair?
Really interesting! nicely presented,nice animation!
I felt like I couldn’t breath this whole video
My experience with scuba diving is that a filled cylinder is always heavier than one that is low on air
Ou should have talked more about vacuum and pressure, that would gave been a lot more shocking and mesmerising
Tell me i'm not the only one who woke up and then watched the video on laptop while still in bed
Depends on the book
Cool! Great video!
that last sentence tho
Mind Blown
Did I miss the part, where you actually answered the question in the title?
1:10
Does this mean that we're all airbenders
brilliant!
I dony need to study if i can watch all of this videos!
What if I stayed in bed until I watched this video? 😛
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??
2:33, I took a deep breath
How did you know i had a pool in my bedroom?
Damn our bodies are awesome
I haven’t left my bed yet
A fluid can be either a gas or a liquid, right?
Daniel Alfonsetti yes gas and liquid are both fluids
That is some deep shit bro.
Darth Vader: *breath in*.......*breath out*.......you don’t know the power, of the air
Was it too hard to say "1,225 kg/m^3 @ sea level and 15°C"? Kidding, nice video.
Anyone else take a nice deep breath?
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.
Thanks for making me aware of my breathing..... again....
If this is the first time hearing anything like this, the last 30 seconds will hit you like a brick.
Every time you inhale, atoms from farts of almost every person who has ever lived, enter your lungs.
how the air pressure can be calculated in a vortex ring of vortex cannon generated by explosive?
So technically I'm an airbender.
ok, so we know that atmospheric pressure and internal pressure are the same and this is what helps us survive...so we know how it works, but why does it work that way?
Why is it that perfect? I want to know why and not how!
Evolution.
The beings that were not born this way died (exploded or imploded) in the begining of life.
Actually, the balance don't need to be 'perfect', just enough to not explode us. Our lungs, when we fill them and stop breathing, the pressure inside is greater than outside, but we don't explode.
plcflame evolution is just a theory! I do not want theories, i want proof or a really logical expalnation!
MuzzaFuzza
If you mean the story of a giant bearded man in the sky, a talking snake, a magic apple, two naked people and an enchanted garden vs. years of scientific evidence ( look up what scientific theory means) you are either ignorant willfully or just so blinded by faith that you can't accept anything other than your own fantasy
***** Are you serious right now? The guy didnt even mention Christianity!!
MuzzaFuzza In scientific environment, theory is a word very different from what we use daily.
hypothesis is something that someone told and nobody have any evidence (is what we call daily 'theory').
In science, theory is something with a lot of evidence ('proofs') that explains how something work.
One evidence of evolution is virus. It's DNA changes every year, that's why we have to take the vaccine.
Or the bacterias, when you take antibiotics not until the end of threatment, you select the best bacteria (without cleaning your body), so, it will reproduce, and this new kind of bacteria is immune to the antibiotic that you took.
That's the theory of evolution. A logic explanation, based on mutation (we can see in microscope), natural selection (we can see hapening in nature) and heritage of DNA (we can see in genetics).
P.S: Sorry for my bad english, is not my native language =//
I demand the air to get my remote control
If air pushing skin from inside and from outside, why don’t we feel pinched pain?
that's also one of the reasons wether is harder to predict than orbits
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?
I watched this video to learn "how heavy is air". How come video does not answer the question in the title?
*a gazillion years later*
_WE’LL ALL TURN INTO MINI-SUNS_
Did a teacher send you this??
Yeye hahahha
Ye lol
So, how heavy IS air? A meter by meter column of air weighs how much?
Yeah, moving through air is walking or running not swimming
So basically we are not different than the fish
Good!
1:22 "because most of it is pressing on the floor and the walls"
It's these kind of statements that make me believe that the videos are written by someone non-scientific. It would be hard to classify such a claim as either false or true. Better to say it's "not even wrong". Importantly, it doesn't represent any physically meaningful concept and explains nothing. You can select any quantity of surface area within that gym and get another meaningless number. It has nothing to do with why air doesn't crush us.
yea gas and liquid fill their containers what you think all the oxygen is just right above you then it would crush you
so how heavy is it?
I don’t know if it’s just me but I think I can see air. If you stare at a white wall for a couple seconds your gonna see very little tiny compacted dots and it looks like it’s moving 🤭