This Is Not a Shockwave

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Sign up to Nebula here: go.nebula.tv/realengineering
Links to everything I do:
beacons.ai/brianmcmanus
Credits:
Writer/Narrator: Brian McManus
Editor: Dylan Hennessy
Animator: Mike Ridolfi
Sound: Graham Haerther
Thumbnail: Simon Buckmaster
[References]
[1] aerorocket.com/Nozzle/Validate...
[2] www.weather.gov/source/zhu/ZH...
[3] www.zehnderamerica.com/absolu...
[4] www.grc.nasa.gov/www/k-12/air...
[5] / 1300787794793713664
[6] large.stanford.edu/courses/201...
Select imagery/video supplied by Getty Images
Thank you to AP Archive for access to their archival footage.
Music by Epidemic Sound: epidemicsound.com/creator
Songs:
Thank you to my patreon supporters: Adam Flohr, Henning Basma, Hank Green, William Leu, Tristan Edwards, Ian Dundore, John & Becki Johnston. Nevin Spoljaric, Jason Clark, Thomas Barth, Johnny MacDonald, Stephen Foland, Alfred Holzheu, Abdulrahman Abdulaziz Binghaith, Brent Higgins, Dexter Appleberry, Alex Pavek, Marko Hirsch, Mikkel Johansen, Hibiyi Mori. Viktor Józsa, Ron Hochsprung

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27 авг 2021

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Комментарии : 917

@nilomosquerapazos1207 2 года назад

When aerodynamics are more interesting than a movie:

@BenBike 2 года назад

Aerodynamics* 😘

@justanerd414 2 года назад

As someone who hasn't watched any movies in years : isn't that the case always?

@nilomosquerapazos1207 2 года назад

@@BenBike oops hahah

@2KOOLURATOOLGaming 2 года назад

It's nice to watch those films that use realism for drama instead of trying to gain drama through unrealism.

@ThinhNguyen-dk3mh 2 года назад

To be more specific *gas dynamics

@mathieuprovencal6392 2 года назад

for the blue light, LOOK FOR Cherenkov radiation. It's when charged particles move faster than light through a medium ( in nuclear reactors it's water). Though, when we say "nothing is faster than the speed of light", it is true, in a vacuum like space. Light can be slowed down when travelling through different mediums like water, making this possible. In water, light travels at 75% of it's vacuum speed.

@40watt53 2 года назад

Let's get this to top comment so we don't need to get Nebula.

@hirvielain9013 2 года назад

I was kinda annoyed that he didn't mention the Cherenkov radiation by name for those who are interested to look it up. Forcing to watch an another video of his for an explanation isn't the way to go.

@BloodAsp 2 года назад

Thank you for pushing for free and avaliable information for all!

@seamon9732 2 года назад

MVP comment

@thethreeheadedmonkey 2 года назад

Don't educate people with FACTS. Who knows where that will lead!

@Blabla130 2 года назад

"Many of you will be looking at the screen with a raise eyebrow right now" I feel personally attacked

@WulfgarOpenthroat 2 года назад

Light travels slower than "the speed of light" when it's moving through a material, like air or water, so it's possible for other things(like electrons) to move faster than it. en.wikipedia.org/wiki/Cherenkov_radiation What we commonly call the speed of light - the universal speed limit - is actually the speed of causality. Light just happens to travel that fast when it's in a vacuum and there's nothing to slow it down. We call c the speed of light in large part because of the order in which things were discovered and named, iirc.

@enhydralutra 2 года назад

Same. And I continued to have a raised brow until "...in water." Oh, yes, okay, that makes perfect sense now.

@merseyviking 2 года назад

I felt less attacked, and more confused as to how he managed to see my face.

@matttzzz2 2 года назад

This video is the epitome of the "well ackchyually" meme

@cr10001 2 года назад

@@WulfgarOpenthroat Thank you for that, saved me from having to make the same explanation. Which would have been almost word for word like yours :)

@MrSeerocket 2 года назад

Great video. As a former aviator who flew the Hornet, I appreciate the clarification of the principles at work. One correction... 2:40 “If we were at 100% *absolute* humidity..”. Absolute humidity is the amount of water vapor per volume, and is independent of the temperature/capacity for the air to hold more vapor (i.e. 5G/m^2) Any time we refer to a percentage humidity, that is, by definition, *relative* humidity.

@jakobrosenqvist4691 2 года назад

I was just about to say the same things.

@WeBeGood06 2 года назад

Ah, you flew a Hornet, cool. Another Clarification, the jet has entered the "Sound Barrier" as indicated by the Supersonic Flow of the Vapor Cone, where water condenses across Supersonic Expansion Waves and evaporates across the Wake Shockwave. The second Boom of the classic boom-Boom forms first as the "Sound Barrier" is entered. The back half of the aircraft is flying in the Supersonic Bubble of the Sound Barrier. So, there actually is a Boom that is finite, circular, and grows to infinity at Mach 1, where the first boom forms. boom-Boom.

@matthewharbour6276 2 года назад

Hey when you break the speed of sound can you feel anything at all?

@55dbk 2 года назад

@@WeBeGood06The vapor cone can form and be visible even if the jet is flying at subsonic speeds. All that is needed is for the expansion zone to have a sufficiently low pressure that water in the air becomes super-saturated and therefore condenses as visible micro-droplets. Higher humidity ambient air requires lower jet speed to produce this effect.

@gregmead2967 Год назад

I see I'm commenting on almost exactly the same thing, a year later. It's odd that the narrator made that weird error.

@nmccw3245 2 года назад

The Cherenkov radiation tease is brutal…

@uwunora 2 года назад

Yeah, doesn't even tell you its name, as if nebula is the only way to understand it

@konstantin.v 2 года назад

Каких ещё черенков? 🤭

@timlash 2 года назад

@@IdunDied Fair I guess, but I drop YT subscriptions when the YT content becomes little more than an ad for their Nebula content. Don't want Nebula, never going to buy Nebula. I don't mind a prompt at the end, but a nasty tease at the end just seems mean. That's not why I follow educational YTers. If they can't make it work on YT, that's fine. Stop. I'm not owed a YT video. But don't rub my nose in the fact that I'm missing out on even better content.

@Kyle-gw6qp 2 года назад

@@IdunDied To be fair, RU-vid has faaaaaar more content than Nebula.

@IdunDied 2 года назад

@@Kyle-gw6qp And also faaaaaar more viewers. Point is way more of those viewers would pay for YT premium if it was cheap and not more expensive than even disney.

@adhithasimhanraghavan7516 2 года назад

This is a vintage type of real engineering video 😍 pure technical stuff explained to the point!

@DyslexicMitochondria 2 года назад

And I love it so much

@sterlingarcher8041 2 года назад

@@DyslexicMitochondria your username made me click on your profile. Your channel is a hidden gem bro

@cobeer1768 2 года назад

Really? Where? All I saw was a teaser and ad for nebula

@WeBeGood06 2 года назад

But wrong.

@konstantin.v 2 года назад

@@cobeer1768 , exactly! 🤭

@aroncoxall3058 2 года назад

"Faster than Light" Me: Lies, deception

@fnorgen 2 года назад

Well, slower than the speed of light in a vacuum, but faster than the speed of light in water.

@theimperfectgod7140 2 года назад

*IMPOSSIBRU!!!*

@aroncoxall3058 2 года назад

@@fnorgenThat's what I was thinking he meant. Very cool.

@WulfgarOpenthroat 2 года назад

en.wikipedia.org/wiki/Cherenkov_radiation Faster than the speed of light through a material, which is slower than c, the speed of causality and universal speed limit.

@ThePowerLover 2 года назад

@@WulfgarOpenthroat Relativistic causality*

@RealEngineering 2 года назад

This video was inspired by a Twitter thread by Dr. Chris Combs, a professor of hypersonics in UTSA. He also helped me research for the X-15 video. Also, the saturation explanation is not strictly accurate, but it’s easier than explaining that the balance of evaporation and condensation changes. Don’t @ me meteorologists

@xx_insert_cool_username_he6876 2 года назад

Twitter has did something good

@RealEngineering 2 года назад

Twitter is class. Just follow cool people like hypersonics researchers.

@nilomosquerapazos1207 2 года назад

Amazing work! Would it be possible that you made a video about the new and insane next gen drones the USAF is developing (mq-25, XQ-58 Valkyrie…) ??

@kirkc9643 2 года назад

@@RealEngineering Twitter is a festering cesspit. A blight on humanity.

@cerealspiller 2 года назад

@@kirkc9643 Something of an over-generalization, IMO. Kind of like saying humanity is a blight on humanity. Wait... nevermind.

@mimikyoo 2 года назад

Real engineering videos be like "if this is not a hot dog: what is it? To answer that question, we need to talk about the industrial revolution..."

@konstantin.v 2 года назад

... and subscribe for Nebula 🤭

@polakrodak8538 2 года назад

And sub to nebula

@tacct1kk715 2 года назад

And buy nebula ffs it's so annoying I'm not paying for that shit sorry

@RetinaBurner 2 года назад

Outstanding explanation. I've known this for years, but it's refreshing to see it explained so thoroughly and simply. Nicely done, as always. :)

@sclarin2 2 года назад

"If we were at 100% max humidity" so Florida then

@LadyAnuB 2 года назад

Or the coast of Central and Northern California during summer.

@AluminumOxide 2 года назад

4:05 the shuttle mission in question is STS-70, and at 5:09 light takes a longer path than the electrons, enabling them to take a shortcut and “appear” traveling faster than light.

@TheWorstBridger Год назад

They are travelling FTL through the medium. In this case water

@jr5960 2 года назад

Love the video. Just a quick note: clouds and the like aren’t made of visible water vapour; as gaseous water is invisible. These are examples of condensed water in liquid form, as tiny micro droplets, small enough for gravity forces to be small relative to other aerodynamic forces, keeping these micro droplets aloft as fog/clouds. Cheers!

@rcpmac 2 года назад

Wow, very interesting point and the only comment worth reading

@michaelhart7569 2 года назад

Yes, I spotted that too. Wasn't sure if it was a slip of the tongue or not. I'm also pretty impressed that he had the courage to quit his day job before even uploading a video. And it's getter braver as RU-vid seems to delete more and more channels it doesn't like for no clear reason, even when they don't breach the terms of service which are deliberately vague.

@Detton80r 11 месяцев назад

@@michaelhart7569 Can't let the simple Truth slip out, can they. lol

@Detton80r 11 месяцев назад

So what we see is the sudden density change? Intriguing...

@JeremieBPCreation 2 года назад

The ending of this video sounds a lot like "Have you heard that modern science is completely wrong? Come give us money to get the ACTUAL TRUTH!!!""

@truthwatcher2096 2 года назад

It's a bit of a teaser to promote Nebula but he's not lying

@JeremieBPCreation 2 года назад

@@truthwatcher2096 I know, I generally have a lot of respect for their work but teasing with such a misleading statement, that is only true with an added context, and hiding the answer behind a paywall, was too similar to the behavior of clickbait and scammers for me to be silent. ¯\_(ツ)_/¯

@tacct1kk715 2 года назад

@@JeremieBPCreation yeah exactly kinda scummy ngl it's very misleading but thanks to the great guys in the comments I learnt what he really meant

@abdulmuhaimintahseen7710 2 года назад

This is the difference between googling something with no knowledge and actually being a smart student. Great video!

@WeBeGood06 2 года назад

Not sure I would say that, he just doesn't know where to look to see the Shockwave in all those images. Because you can see the Wake Shockwave in most of those images. It's where the cloud evaporates as pressure and temperature increase across the supersonic flow returns to subsonic flows. The base of the cone is a visible shockwave.

@konstantin.v 2 года назад

@@WeBeGood06 , cannot the cone appear without the aircraft going supersonic? 🤔

@WeBeGood06 2 года назад

@@konstantin.v The cone appears before Mach 1, it is supersonic flow. The tail of the aircraft flies supersonic before the bow of the aircraft. The cone are the Expansion Fans or Expansion Waves of the Sound Barrier. The top of the cone is the Wake Shockwave. The Nose of the Aircraft is the last part of the aircraft to fly supersonically.

@konstantin.v 2 года назад

@@WeBeGood06 , thanks! It makes sense. I was just wondering if those cloudlike protuberances can appear without anything going supersonic at all. After all, the plane does alter the pressure around it as it flies even when everything is subsonic 🙂

@Twas-RightHere 2 года назад

5:34 "All ads are cut from the nebula version" Me: *sips tea with adbocker on*

@ThirstyFish3918 2 года назад

*while watching an ad for nebula

@patrykc9050 2 года назад

I love this channel! If I wasn’t a broke medical student in hundreds of thousands dollars in debt, I’d sign up for nebula in a heart beat! Hopefully in the near future!

@elena6516 2 года назад

nobody cares

@jonathanmeza6527 2 года назад

@@elena6516 Nobody cares about your comments

@patrykc9050 2 года назад

@@elena6516 I hope you have a wonderful day!

@ilyamiskov 2 года назад

@AkkiSciChannel The truth is, nobody truly cares about anyone but themselves.

@friedrichvonsnatch3501 2 года назад

Do you ever have to pay off student loansthe US? In the UK it's very rare anyone pays off any decent amount

@JV-lq3tx 2 года назад

Impeccable timing. I was at an air show today and got to see several of these cones.

@5MadMovieMakers Месяц назад

Before this video: "Sonic booms look so cool!" After this video: "Vapor cones look so cool!"

@TheCardq 2 года назад

This has been the most compelling ad for nebula I've seen

@Lyerbait13 2 года назад

For real. I might actually get it now

@dido1803 2 года назад

I totally agreed. I'm going to subscribe.

@banksofbarcelona3893 2 года назад

Not a sonic boom? I guess we'd never know the secrets of Guile of Street Fighter!

@sircrapalot9954 2 года назад

Guile’s hair was completely out of Air Force regs too.

@banksofbarcelona3893 2 года назад

@@sircrapalot9954 exactly.haha

@YounesLayachi 2 года назад

A sonic boom will be followed by a condensation cone, but the opposite isn't always true. You can also check footage of big explosions, where massive shockwaves are created and followed closely by a wall of condensating water droplets

@nikospapageorgiou57 2 года назад

Cherenkov radiation isn't something new. But just saying that these particles move faster than the speed of light within a medium, does not help in making people understand, that the speed of light within a medium like water, is significantly lower than that within a vacuum (300.000Km/sec)

@NosiAttack 2 года назад

As a Guile player I do appreciate you finally clarifying that those are not sonic booms.

@Etherkai 2 года назад

*Guile theme intensifies*

@jeffbenton6183 2 года назад

Is Guile a video game?

@remliqa 2 года назад

@@jeffbenton6183 No, it's a movie .

@deus_ex_machina_ 2 года назад

@@jeffbenton6183 Guile is a character from the arcade, and later console/PC videogame franchise 'Street Fighter'.

@juice6521 2 года назад

SONICCU BOOM

@tinglydingle 2 года назад

Thank you so much for making this. I've had so many arguments with people online about this, and now rather than type out a rebuttal each time, I can just link this video.

@joshsvoss 2 года назад

Isn't the vapor caused by a drop in pressure, rather than a drop in temperature???

@theOrionsarms 2 года назад

Not, the condensation don't happen if you decrease pressure whiteout a decrease in temperature, but a sudden decrease in pressure reduce the temperature too.

@joshsvoss 2 года назад

@@theOrionsarms ahhh. So the reduced pressure causes reduced temperature, which causes the condensation, is that right?

@theOrionsarms 2 года назад

@@joshsvoss this is the correct explanation.

@dylreesYT 2 года назад

"Many of you will be looking at the screen with a raised eyebrow" more like a confused squinting face but yes 😂😂

@UllalPrajwal 2 года назад

Interesting to finally learn about these cones, had witnessed them several times in the outskirts of town, who's air space was used as training area by Air force

@okithdesilva7644 2 года назад

I love your all videos and and your Space and Energy Playlists

@monteiro5306 2 года назад

It can be seen on the wing tips of F-1 cars when racing on tracks such as Spa-Francorchamps. Amazing video Brian. As always an awesome job. Greetings from a Brazilian subscriber.

@haaake 2 года назад

Not really at all comparable to a jet traveling in a straight line forming these particular type of cones that absolutely ARE formed from air moving at transonic speeds. It happens when you have large pressure differentials from air traveling at very high speeds, like on the backside/end plates of an F1 wing, or behind a transonic shockwave forming around leading edges of a fighter jet. It can happen subsonic but doesn’t mean it doesn’t also happen with transonic air. Saying this cone isn’t ever visualizing a transonic shockwave is a dumb semantics argument. Which engineers love to make all the time.

@dbeasleyphx 2 года назад

So happy for this video. I’ve known all along it’s not a sonic boom, but it is such a “common knowledge”.

@AxxLAfriku 2 года назад

One thing! Just one thing! Please tell IT to me: WHY tf do I have so many fans even though no RU-vidr is unprettier than I am? WORLDWIDE!!!! WHY??? Tell me, dear dav

@fernbedek6302 2 года назад

So, it's not a sonic boom shockwave, its... the result of the sonic boom shockwave? That feels only a step removed from saying you're not seeing an object, you're just seeing the photons that reflected off the object.

@KeppyKep 2 года назад

0:10 Talks about how google images is wrong that it's a sonic boom. But he searched for "shock wave". And the main image he zoomed in on has the caption "You think this is a sonic boom... but it's not."

@Nova_501 2 года назад

4:58 made me laugh more than it should’ve. I had both eyebrows raised when you said that 😂

@cerealspiller 2 года назад

For some reason, the first image that came to me when I saw this was a lab, sitting at my side, patiently watching the video with me. And periodically raising an eye brow.

@sabarishr381 2 года назад

THANK YOU for teaching me a new thing today !!

@ac30428 2 года назад

That first transition from the plane flying to the google pic was f*cking cool

@stevefox3763 2 года назад

You can also see the vapour clouds/trails coming off the rear wing of an F1 car :)

@patwawryk7717 2 года назад

I honestly love hour long videos and when they are good, they're a gem when I find a good one on RU-vid!

@marvihaemmer99 2 года назад

Sadly, that is not really the point. Of course it's great that you love videos like that. I do too. But from a creator perspective it is just so much more effort to create a video, just for RU-vid to not really suggest it to viewers. In the end it's literally more effort for less of a reward (less views), so it really does not make sense for creators.

@patwawryk7717 2 года назад

@@marvihaemmer99 yeah I fully understand stand

@MrAlexs888 2 года назад

5:00 what about the shockwaves from a far away explosion? You can see that clearly in videos

@robspiess 2 года назад

Yes, this is what I was also thinking.

@rcpmac 2 года назад

What you see is the effect of the shockwave on objects and particles in the air

@JCisHere778 2 года назад

You should lookup the taylor neumann sedov blast. Especially the pressure distribution. Although the pressure spikes momentarily after the shock, it decreases below the ambient pressure. Resulting in the condensation of vapour

@MrAlexs888 2 года назад

@@JCisHere778 i mean those explosions from myhtbusters or i donno, you can see a clear line in the blue sky travelling away, is that also condensation?

@whuzzzup 2 года назад

@@MrAlexs888 Maybe it's an effect like a mirage?

@WeBeGood06 2 года назад

0:09 THIS IS A SHOCKWAVE, it is the Sound Barrier. The first Shockwave Sneaks up from Behind in the Wake of the Aircraft as it pushes into the Sound Barrier. Clouds form in the Expansion Waves in Supersonic Airflow associated with the Sound Barrier. The Clouds remain until it enters the Wake Shockwave at or behind the tail of the Aircraft, where there is an abrupt increase in pressure and temperature causing the Cloud to Evaporate. The Cloud is Evaporating in the Wake Shockwave, which forms before the Bow Shockwave at Mach 1. It will becomes the second Boom of the classic Sonic Boom-Boom of an Aircraft flying at Supersonic Speeds.

@jacobbaumgardner3406 2 года назад

I knew the basics of how it worked, but the details such as the expansion zone bring light to what otherwise would've remained dark to me. Thanks you.

@georgezhou2314 2 года назад

i never knew this, Thank you for explaining!

@jlee4039 2 года назад

Thank you! I would ask how sound waves could have a visual manifestation like that and was always told I was wrong.

@StonedRedneckMarine 2 года назад

I'm a bit surprised at there being no mention of the temperature changes being due to the rapid changes from high pressure to low pressure causing the expanding of the gasses in the air

@codybecker 2 года назад

Just signed up for CuriosityStream and Nebula with you code! Excited to start learning 😁

@Red_Twizzler 2 года назад

“15 minute is too long for RU-vid algorithms” says no one with a successful RU-vid channel.

@6alecapristrudel 2 года назад

I agree that "the algorithm" is a shitty excuse, but ya gotta wonder how much money are they making from nebula then? It has to be worth their time to make longer videos exclusively for that platform.

@ShinodaChan 2 года назад

Ironically it just turns me away from Nebula / CuriosityStream more and more when content creators cut their videos short so that they can have an extended cut on another platform I hardly had any interest in to begin with. Doesn't help that said content creators constantly shill the same few services (Skillshare, Nebula etc.) to the point where even hearing their name can be annoying.

@Zveebo 2 года назад

Yeah, it just annoys me when creators cut big parts of their videos to make Nebula versions better - especially when they then spend the time talking about Nebula 🙄

@rcpmac 2 года назад

What he said was 1hour is too long for the RU-vid algorithm so it will be broken up into segments

@CephaloG0D 2 года назад

Literally split it into 15 minute segments and upload them once a week until the series is finished. "But it's 52 minutes, not 60". Perfect! You have 8 minutes to place ads.

@Jallandhara 2 года назад

It’s called Cherenkov radiation. There, I just saved your personal information from being sold.

@terencetam2122 2 года назад

5:10 Electrons traveling faster than light... in water

@wildlifecameraYT 2 года назад

This is the type of engineering videos I like, thank you for the lovely content!

@fuchsfalke5063 2 года назад

I'd say the many recommendations Tom Scott got for his copyright video (35min) counters the argument of an 20min video being to long.

@rcpmac 2 года назад

The man said 60 minutes is too long, not 20.

@heh2393 2 года назад

Ayy I love yer vids! When i go to college you will be my first Patreon (fingers crossed)!

@abdulmuhaimintahseen7710 2 года назад

Same for me, I hope. I would say students are the most interested in these topics. And it definitely helps us in our STEM subjects. However, we are all mostly broke and unemployed if you think about it.

@heh2393 2 года назад

@@abdulmuhaimintahseen7710 Hey, fingers crossed! We'll make it through buddy!

@saturnv2419 2 года назад

"Cherenkov effect, could happen with minimum radiation."

@memorycl 2 года назад

Condensation cones are not an indicator that these jets are supersonic. They also show up at high transonic speeds. See plenty of Blue Angel pics online; they get cones but never crack Mach 1. Shockwaves are present on the aircraft surface but the aircraft is not moving faster than the speed of sound.

@WeBeGood06 2 года назад

Actually the "cone" shape is supersonic flow, it gets it's shape from expansion waves followed by a shockwave. It really is a Supersonic Cloud and the tail of the Blue Angel's jet will attain supersonic flight before the nose of the aircraft.

@gpaull2 2 года назад

Nebula needs comments. Half the fun of RU-vid is the comment section. I won’t be renewing.

@aryehoser8902 2 года назад

PLEASE DO AN EPISODE ON THE DIFFERENTIAL/ANALYTICAL ENGINE - THE MECHANICAL CALCULATOR

@ellisjackson3355 2 года назад

That sounds like it would be interesting. Just like the mechanical ECMs that BMW planes had during ww2

@doctorr1521 2 года назад

Dude that open editing was amazing

@thespongeisright774 2 года назад

Does anyone know the difference between an introverted engineer and an extroverted one? An introverted engineer looks at his shoes when he talks to you. But, an extroverted engineer looks at your shoes when he talks to you.

@firebry23 2 года назад

Is it a tempature charge? Or is it because of the pressure difference? Kind like how propeller cavitates in water

@EigenvectorSeven 2 года назад

It's both. In a gas, temperature, pressure and density are all linked. If you decrease the temp, the pressure must decrease with it, and vice versa. And relative humidity depends on both temp and pressure.

@avineshblah5739 2 года назад

When pressure decreases temperature also goes down

@MoritzvonSchweinitz 2 года назад

Since the speed of sound depends on pressure, and the sonic shockwave has very high pressure - does this affect each other somehow?

@dsdy1205 2 года назад

the speed of sound depends purely on temperature, which is proportional to the ratio between pressure and density. Shockwaves always result in an increase in entropy, which can sometimes manifest as an increase in temperature, which can affect the local speed of sound.

@ahobimo732 2 года назад

Man, the stock footage in this video was just stunning. He could have been reading the ingredients in a can of soup and I would have kept watching.

@BRUXXUS 2 года назад

Got to love when the first video in nearly two months is 1/3 advertising. 😕

@holz_name 2 года назад

"Electrons travel faster than light" - my reaction: and...? - he didn't say electrons travel faster that the speed of light in a vacuum.

@Miftahul_786 2 года назад

Why does the temperature decrease with a pressure increase?

@polarisbear7468 2 года назад

Other way around, temperature decreases with pressure.

@Miftahul_786 2 года назад

@@polarisbear7468 so does the pressure behind, let's say the aircraft, decrease because at the front of the plane there is a pressure increase so behind it there is a decrease. So with a pressure decrease behind the plane there is also a temperature decrease.

@Miftahul_786 2 года назад

@@polarisbear7468 I've just rewatched the video and have realised that the video is that it is not a shockwave since a shockwave is an increase in pressure. And for some reason I got confused and thought there was an increase in pressure behind the plane. However, it is an expansion fan that is created which leads to the pressure along with the temperature.

@drvanon 2 года назад

It does not, the area behind the pressure increase decreases in pressure, correspondingly decreasing temperature.

@ArdhenduChakraborty621 2 года назад

FINALLY someone has said this. Shockwaves can only be seen through methods such as Schlieren Imaging (or Numerical Schlieren Imaging as in my lab), but the thing that we see across these planes, IS NOT shockwave.

@clf400 2 года назад

I saw a great thread on Twitter about this. Now a video by you? Amazing

@RealEngineering 2 года назад

The video was made because of that thread. Dr. Chris Combs has acted as a consultant for quite a few videos in the channel. He’s great

@banksofbarcelona3893 2 года назад

Teachers like you teach and do the world good, lesson taught is mostly understood!

@hamdog5441 2 года назад

what about seeing a shockwave from an explosion though?

@EigenvectorSeven 2 года назад

You can still only see it because of light distortion.

@TheNapalmFTW 2 года назад

Man this video was too short. Thanks Brian

@kkkk-wg6je 2 года назад

I love videos like this. Just changed my previous understanding of the world around me. Thank you!

@MortyMortyMorty 2 года назад

This 5 minute video taught me more than I learned in the last week.

@jackbequick 2 года назад

Then you're learning wrong

@MortyMortyMorty 2 года назад

@@jackbequick Pov: You look in the mirror: 🤡

@amirattamimi8765 2 года назад

2:25 relative humidity not absolutely humidity Sorry annoying but wrong is wrong 😉

@baksatibi 2 года назад

2:06 Are you sure about this? Explosions sometimes have a visible shock wave due to light refracting at the edge of the wave. I always thought that a shock wave from an explosion and from a supersonic object is basically the same phenomenon.

@MrCarroll 2 года назад

I like this short video style! Great explanation

@GraphicJ 2 года назад

Fyi: sound speed of 340 meters per second is 760 mph.

@Zveebo 2 года назад

LMAO at 60 minutes allegedly being too long for the RU-vid algorithm when Noah-Caldwell Gervais easily picked up 400k views for his latest 7 and a half *hours* long video 😂 If you make great content and people like watching it, that’s all the algorithm cares about.

@kweezynonya955 Год назад

5:02 "Eyebrows Definitely Raised" 🤣👏👍🙏🏆

@caio5987 2 года назад

This is just a glorified ad for nebula

@sandybarnes887 2 года назад

My favorite example of this is a F1 or other race car on a humid day and a vortex appears coming off the ends of the rear wing.

@trevorvano 2 года назад

Oooo never been happier to be on Nebula, that 787 doc sounds amazing

@ohaviafeldman8535 2 года назад

"Many of you are going to be looking at the screen with a raised eyebrow right now" I'm was trying so hard but I can only do them both at the same time.

@regolith1350 2 года назад

Just to double check that us non-engineers are understanding this correctly... When air travels over a convex shape, an "expansion fan" is created behind it. This expansion lowers the air pressure, which then lowers the temperature, which then (under the right conditions) causes the water vapor to come out of solution (condensation) and become visible as a "vapor cone". And this occurs because of two basic phenomena: 1) the direct link between pressure and temperature 2) the lower carrying capacity of colder air Is that about right?

@morganmcintire2853 2 года назад

I tried to explain to my friend (who is in the air force) why these weren't shockwaves about a year ago and failed to convince him. Now I can just send him this video :-). Winning feel good.

@pietro.c 2 года назад

2:21 mount Sassolungo (Dolomiti-Val Gardena, Italy)

@gustavderkits8433 2 года назад

Thank you! I’ve been telling people for years that these hundreds of phots were not all taken “just at the moment when the plane breaks the sound barrier” as captions insist. I kept insisting on water and mentioning ionization chambers, but nobody listens

@fabiovezzari2895 2 года назад

5:00 "A shockwave that occurs when something travels faster then the speed of light" 5:02 me: proceeding to raise my eyebrows 5:05 "many of you will be looking at the screen with a raised eyebrow" ....Damn he knows his chickens

@rogerking7258 2 года назад

Great explanation. Can you now do one correcting the often heard statement that the reason very fast moving objects (vehicles during re-entry as an example) get very hot because of friction as the air passes over them. In fact it's mainly due to compression of the air that can't get out of the way at such speeds that gives rise to the heat.

@user-ih9ig9ih8y 2 года назад

But compression and expansion themselves cannot cause temperature difference, only viscous friction. Which is, of course, present between the air layers, mainly in the boundary layer, not just on the aircraft surface

@Allan_son 2 года назад

@@user-ih9ig9ih8y Daniel, no. Pressure changes associated with compression are directly related to temperature increases. Diesel engines work on exactly this principle. Read about adiabatic processes....if we compress/expand air it will heat/cool.

@Allan_son 2 года назад

This was not a great explanation. He gets the basic idea sort of right, but there is a lot of nonsense in the details. Explaining compressional heating is way beyond him.

@Sarge714 2 года назад

Ummmmm. You and I learned different on this. A shock wave in what creates the condensation cone. Remember you can have supersonic flow over parts of the aircraft at subsonic speeds. This is your next video. There are videos online from passengers that show the shockware along the wing of airliners in while in cruise. Great video for something to look for for people who fly. I've seen it, its amazing. In fact a video of top 10 things to look for next time you fly would be awesome. Supersonic flow to all the different types of contrails (air condensing) that can be seen in different stages of flight.

@adamwathen5962 2 года назад

Another good example is the Falcon 9 launch from spacex a few months ago, when you can see the water vapor, then a few seconds later you can hear the actual shockwave. Another amazing video to watch, thanks!

@Gunbudder 2 года назад

i have a friend that got to do research on Antarctica with neutrino detection. The detector relied on cherenkov radiation to indicate that a neutrino had interacted with the device. from what i remember, the neutrino would blast through the tank of fluid and cause electrons to break off and move faster than the speed of light through that fluid. pretty sweet research lol. maybe one day we will have smaller detectors that don't require you to hang out on the bottom of the planet to use them

@cogentdesign 2 года назад

Excellent video. I plan to subscribe to Nebula tomorrow when I get home.

@Karibo_0 2 года назад

pretty cool video :) but if I may, this is not vapor. You can never see vapor as it is a transparent gas (aka humidity), although what we see above boiling water and in any other cloud-like types of waters is condensed liquid water due to -as you said- having more than 100% humidity in the local pressure/temperature environnement.

@Pwn3dbyth3n00b 2 года назад

My Google Assistant activated like 3 times during this entire video...

@calholli 2 года назад

There's a short expansion fan ad in your nebula video.

@vicenteeichler8804 Год назад

Hello Real Engineering, I think the video is very well done and I learned something I don't know as an Aerospace Eng. student. What is you background for curiosity, I saw your references and you are able to condense and simplify a lot of complicated info, that's amazing, I would like to that as well.

@theedge5584 2 года назад

That's how they Disguise the crafts......PERFECT camo when in the sky

@AlChemicalLife 2 года назад

You can also see this effect on Sprint cars when they are racing in humid air! A guy i met at the track showed me a few photos he caught of the vapor trail on the wings of the sprint cars !

@oneguy9916 2 года назад

I still don't understand why the temperature get lower by the plane?

@Mshagy02 2 года назад

Man is releasing extended Snyder cuts of RU-vid videos

@samuelasieduawuah296 Месяц назад

No one has provided me with a better explanation of shockwaves. Amazing!!!

@Homoprimatesapiens 2 года назад

Why does that triangular vapor fan always occur when the aircraft fly a specific speed and when the vapor fan move from nose tip to tail there is always that boom as loud as a bomb explosion?

@LAG09 2 года назад

Seeing all those "sonic boom" pictures and videos I knew it wasn't a sonic boom and not just because the planes were travelling *WAY* too slow to make one. Thanks for making this video to explain that.