The Schlieren Effect - Amazing Demonstration!

This unreal experiment allows you to see air movement around any object.
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This is a demonstration of the Schlieren effect. This setup allows you to see changes in air density. The point light source is aimed at the concave mirror. The concave mirror reflects to a focal point. There you use a sharp edged object to partially block the light which helps create a shadow effect that allows you to see air movement.
Big Thank you to:
Ruud Verdaasdonk
Ko van der Lubbe
Phil Koken
VUMC
and everyone else that helped with this project.
Other Schlieren videos to check out:
• Schlieren Optics
• Many Things Shown With...

[@AntVenom]

I think this re-defines insane! In the best possible way.

[@opuer2]

dafuq

[@PDZofficial]

Oh hey Ant didn't expect to see ya here

[@ebennett3655]

hi ant

[@Gago3000LP]

😊yea definitly

[@Fr00stee]

Apparently antvenom is subscribed to this channel

[@Nighthawkinlight]

Well you got me beat.

[@Draftyspirit]

well step up your game 17.9235x

[@rycasV]

Maybe do one of your own with the floating screw driver, or the spotlight, or cheeseball launcher. Basically put your own projects in front of one! I'd watch that! Also nicely done Brusspup!

[@stuartcR]

maybe you can use this method instead of the laser and fog.

[@electrobus5095]

well maybe a little bit ^^ but cwhy cant you see it with youre bare eyes ?

[@hellterminator]

If you do make your own, make sure to include an explanation of how it works. That's the one thing I'm missing in this video.

[@pocket83]

This was wonderful. Thank you.

[@yardcoder6833]

(1:03)Hot air rises and (2:22)cold air falls

[@ouimanbou6084]

kinda make you wonder how everything went sideways, huh?

[@yamilsaleh8477]

No emtiendo inglés

[@samy7342]

PESCA JY Dice "el aire caliente se levanta y el frío cae"

[@ryanekklesia504]

Gravity debunked

[@roshansebastian1862]

Good Observation

[@anishsurepeddi5422]

Last time Brusspup posted Ryan Lochte wasn't a liar and Harambe was alive

[@Thejrrg]

Lol

[@dwdesign2873]

hehehee

[@tacosKebab4]

Who are Harambe ?

[@tacosKebab4]

+Potato Tato oooooowh yes i see ! Hm... you know, if they tryed to make sleep this gorrila the gorrila will killed the baybe :/ Its sad to see this animal died but a human is more precious. I dont like to say that when u see some humans >_

[@tacosKebab4]

+qoaa Harambe was a pokemon.

[@TheProMagician-hf7fs]

welp... see u in another year. lol

[@001100AAAEA]

Let's just hope otherwise

[@morissmor]

Funny and original lol

[@chriswellmangahas]

XD

[@kwistopher1915]

Last time he uploaded was 8 months ago :P

[@Wumbolo]

Does the woman in the video appear in every video?

[@WhatWillHappenIf0]

One of the coolest things I have ever watched. Great job. ☺

[@ArmanVesona]

What thee... This is so awesome!!!

[@azpzakking2792]

Bang komennya jangan di apus

[@SleepyListener007]

i find this so satisfying to watch

[@lamarmurtada2688]

Yaaaaas

[@alexandruilea6471]

me too

[@ThinkCleverAndSmart]

+Ilea Alex watching it a couple of times and it is still satisfying! :D

[@kacper4551]

Someone needs to fart in this

[@TheMindofagenius1]

HAHAHAHA that's GENIUS!! XD

[@Fr00stee]

Burping could work to.... And it would be much easier

[@Lagger130]

exactly my thoughts

[@ianciborowski2983]

Buzzfeed did it

[@JoeBidenEnthusiast]

Buzzfeed did this lol

[@HelloBrothersGaming]

If my mind is going to be blown every time you release a video, then I can stand the wait in-between.

[@ohEphixia]

"How does a fart look like" was my immediate question

[@soulandfresh]

Well that's an awful question. A pretty good question I thought of is 'what would a fart look like?'

[@ohEphixia]

I don't have to have correct grammar for my point to go through your head

[@samy7342]

lol

[@mackmittens4391]

Killastrator bro I never ran to a comment section fast enough

[@rohitdhende9969]

"What does a fart look like?" This sentence looks good

[@socrates2451]

No way, is this what I think it is? Brusspup? IN MY SUB FEED? I must be drunk

[@brusspup]

I'm alive!! and you're probably drunk. :P

[@socrates2451]

+brusspup No way, and you even replied? I sure as hell am convinced that I'm drunk now

[@chagmenlietons3606]

I must feel the effects of alcohol poisoning, even though I haven't drank anything all day, seeing this.

[@maximilianthondanpallil3368]

+brusspup nice vid.! when is your next video coming ? 😆

[@AntonioMartinez-du8ps]

gotta wait another year to watch the next vid XD

[@JackSinger]

Glad to have you back!

[@lamarmurtada2688]

Yep

[@elduendeamarillo3853]

You're simply and by far one of the best youtubers! I've no doubt about it. The content, the background music, and the scenography it's beatifull and enjoyable for anyone. Keep bringing videos, please!!

[@redalertsteve_]

Woah this channel got big and it still is satisfying to watch.

[@Rulerofwax24]

I've seen this in a few contexts, including an explanation of how it works, and it is always incredibly entertaining to see the effects. Awesome upload, yet again!

[@armymansam]

I wonder what it would look like if you farted in front of the mirror...

[@brusspup]

I'm not sure what it would look like, but I can tell you what it would smell like.

[@Roetheperfect]

YES... And a Speaker too

[@FunZack11]

+brusspup It's great to see another video from you guys! This is my favorite channel, so it's always awesome when you upload another video :)

[@giraffe7753]

Questions like this are what brought science this far.

[@moth6159]

yass lol

[@High_Altitude_Observer]

She's very gifted. Even compose her own music for her channel :D

[@yann6839]

so happy to see this chanel come back

[@kcwidman]

Anyone else completely mind blown? I NEED TO KNOW WHATS GOING ON.

[@TheMindofagenius1]

Brusspup is back, that's what's going on ;b

[@kiprs]

en.wikipedia.org/wiki/Schlieren

[@Godosomethingtwice]

Same.

[@TheSe7enman]

The differences in air pressure created by how or cold air is made clearly visible by this Schlieren effect. That is why you can see the hot or cold air from the hand, an icicle, etc.

[@unambitious]

Want to know something else crazy? It was invented by a German in the 1800s to study super sonic air flow.

[@illdie314]

I've always wanted to see what air looked like as a fluid. This is so cool!

[@jennhoff03]

WHAT?!?!?!?! How did this not go viral?! I've never seen anything like it before. It's so so beautiful.

[@official-obama]

I was about to delete the reply and I realized that was my old account

[@WhatComesAroundTM]

This would be so useful in aerodynamic development

[@ARBB1]

This IS used in aerodynamics, are you mad?

[@WhatComesAroundTM]

Artur Renato B.B Thanks for letting me know. But the "are you mad" part of your comment put me off. I'm still in college. Sorry I don't know what I haven't been taught yet, I must really be quite mad!

[@ARBB1]

Sorry m8, didn't want to offend you. College for what exactly?

[@WhatComesAroundTM]

Artur Renato B.B No problem, I wasn't offended, just felt it was out of place. I am studying a-levels and then I'll probably be going to Germany for Uni, I want to study automotive engineering there.

[@LuckyAnanda]

What Comes Around™ goodluck dude

[@mrfuzzyibrows]

what exactly does the razor blade do to make the process possible?

[@IceMetalPunk]

It acts as a sort of diffraction grating, creating shadows from light coming at different angles; the shadows are what you're seeing.

[@alflud]

Thanks and thanks .... I looked and there it was - the question and the answer. I wouldn't have stopped until i found out what the purpose of the razor was ;)

[@MrWnw]

Hello. You seem like u understand this. Could you help me or direct me how to make this/ where to find how to? :O

[@Hotmedal]

You need a concave mirror and a light source next to the camera aimed at the mirror. Find the focal point of the mirror and put the razor there and the camera just behind it. Then focus the camera.

[@MrWnw]

The light source can be a regular bulb? The distance between the razor and the camere is set to a specific value or it doesnt matter? Do I need any special camera or any specific camera parameter? Thank you :O

[@moustacheguy6663]

took you 8 months to make this vid??

[@brusspup]

Well, I have been busy doing other things, but actually this video did take 8 months, off and on, to coordinate and film.

[@daftbence]

+brusspup Awesome result, totaly worth the waiting for it!

[@prestonjd04]

+brusspup what we're doing during the last 8 months

[@bananainamug6259]

it's their channel

[@redalertsteve_]

+Preston Davis why do you give a fuck

[@amaury35]

glad to see you're still there!

[@robottwrecks5236]

You did such a good job with this! Thanks for the great video! I've thought about this property before but to see it work is really cool.

[@NinaHouston]

Great video again! Love it:-)

[@uwvadertje]

wow this guy isn't dead

[@SimpleCartoon]

It's a girl...?

[@uwvadertje]

+THE CHALLENGE hey that's cool you replied to my comment I'm a longtime sub of urs!

[@jermainewakeup]

A guy and his wife :)

[@SimpleCartoon]

Felicia Alejandro Ayyy awesome seeing a fan here!!

[@MaximaToluene]

isn't this his sister?

[@greeenpro2009]

This is spectacular brusspup!! Glad you're back.

[@codediporpal]

I've read about this effect, but never seen such an amazing application!

[@Admired]

Now I see how the term "Smoke and Mirrors" came to be.

[@ModernGameArmy]

Wow it's been 8 months since your last upload

[@JoeNoBuddy]

My mind is blown right now with this. Awesome man thanks.

[@jaxnean2663]

Cool air drops down, hot air rises up, a sea of air! Amazing as ever, totally love your channel.

[@sanchezhernandezluisdavid8578]

Estos vídeos son geniales, siempre nos muestran que algo más sucede, algo más allá de nuestra vista, algo que ignoramos por preocuparnos tanto en nuestras pequeñas vidas, lo más importante es no olvidar que hay cosas que aunque no creamos en ellas, suceden, me encanta este canal, felicidades

[@TheSentientCloud]

So you're just going to show us some cool science without explaining to us how it works?

[@pedro55rules]

Read the description

[@jkrai9684]

it's all just smoke and mirrors.

[@killercatapiller]

International Space Station has to do with the spectrum of light you can see through a camera. Its just like the lazer videos. You cant see the lazer beam with your eyes but you can see it through your camera.

[@julioequinones]

Although this is science it's also a beautiful piece of art and I I'm perfectly fine watching another video to explain it because wow this was good

[@TheOriginalSycHolic]

the beginning was showing how it worked. they show the point light source, and the razor as the knife edge. its using refraction to show the changes in air density. en.wikipedia.org/wiki/Schlieren_photography

[@kingfullmetal]

I actually thought I had been automatically unsubscribed from you, for a moment there. Great to see a new video, and this one is fantastic! At first I thought you might somehow be seeing a form of thermal energy, but the popsicle made it apparent to me what was going on. Excellent video, as always, and I look forward to the next!

[@AnasAhmedNazeer]

Even if you upload once every half year. I'm glad you do that. Thankyou for another great video

[@itsYakuza]

She looks so nice

[@galaristmusic3415]

Now you can detect ghosts. 👻

[@thehacker7488]

who you gonna call?

[@maximo1590]

The hacker ! GHOST *C A M E R A M E N*

[@essef.]

Gh..gh..gh..gh..ghost!

[@jameswatsonatheistgamer]

You can't. They're not real

[@austin-hh3mg]

James Watson Atheist Gamer yes they are they are souls or people spirits still on earth because they have not yet found peace

[@guliusantonica2910]

This is FANTASTIC!

[@LRBaquatics]

Love the similarities between the fluidity of water and air. Great experiment! Love how you can see her reiki

[@jackman3503]

wow, ur back!!! :-)

[@brusspup]

:D

[@jackman3503]

+brusspup ..with a reply. thanks ^-^ :D

[@lamarmurtada2688]

Yayayayayay😀

[@JunHijam]

fish can't see water humans can't see air

[@JunHijam]

Ian thats what the fish said

[@ouimanbou6084]

fish can't see water humans can't see air I've seen sunny days that I thought would never end. I've seen lonely times when I could not find a friend, But I always thought that I'd see you one more time again.

[@CarlosSanchez-kd8et]

oui manbou GREAT rhyme

[@NG-sz2xi]

Ian hmm nah

[@soupricemf1260]

But.. spongebob can see the beach?

[@Alex-ws5pv]

as every-other video you post, simply awesome

[@ShahrukHossain]

This amazing ! I knew of the Schrillen camera before, but didnt know that you could replicate it's ability using a razor and a mirror ! :D Nice to see your videos again after so long !

[@aabbccddeeffgg1234]

oh, youre back, had completely forgotten about you :p so what have you been up to these days?

[@brusspup]

Hey! Quite a bit actually, and I've been working on getting this video produced on and off for the past 8 months. Finally it's done! :D

[@mb98765]

+brusspup Omg, just today, after like 5 months, I looked up your chanel, and guess what, on the same day, you uploaded :O

[@ahmedsoudy4486]

+brusspup Can Any one do it.....If so What we want to do it?! plz answer

[@aabbccddeeffgg1234]

8 months? something must have been a pain in the ass to do/get right/set up then :p gratz on completing it, awesome video as always.

[@chelseybuford5807]

I don't mean to be offensive, but what the hell was so complicate about this video that it took you eight months?

[@MrVinney96]

Holy moly a brusspup video. Also, the names in the description give me the impression that you're Dutch. Are you?

[@wapje223]

i thought the exact same thing. maar is het vumc dan een universiteit?

[@vinno97]

VUMC is the academic hospital in Amsterdam (if I'm not mistaken)

[@MrVinney96]

Yep, Vrije Universiteit Medisch Centrum.

[@boringbluegirl]

Yes they are. The girl has an own KZbin Channel named MeisjeDjamilla!

[@SolarWebsite]

+Vel0city Indeed. The best hospital in NL. Because I work there ;-)

[@jakeh2034]

Glad to see a new video!

[@thefaceofahonestman1206]

hey what a nice vid brusspup! here we go again another one or two years!

[@philruu]

How can you even discover effects like this??

[@aeromodeller1]

It comes from testing telescope mirrors with a straightedge.

[@mitch3443ful]

Don't cross the streams Egon.

[@25manfredo]

great work on the improved production.

[@AnneloesF]

That's beautiful. Thank you.

[@mapledoctor3915]

The slow mo guys need to do this.

[@w00tplayaw00t]

What's the girls name, for scientific purposes?

[@iambiggus]

He was probably hoping for something like Sharron Cox.

[@gpcaraudio]

Jenna Talia

[@thedankoona_5854]

she got another dutch channel; meisjedjamila or something...

[@efisgpr]

TheDankOona ಠ_ಠ yep & DxDutch 👍 😁

[@totenkopf19]

I too, just starring at her not the mirror 😍😍

[@megamechdavis803]

Brusspup we NEED you back KZbin needs a professional at what you do it's just not the same

[@HenkvanAlphen]

Awesome B. Looks stunning

[@Auruchius]

Didnt we all think this channel was dead?

[@jennanelson5453]

Tears stream down my face everytime I watch this, which is often. My favourite video. Thank you for doing an impeccable job of making this video.

[@bronsonstephens5799]

Wow! That's so cool! The flame and heat looks like it's underwater!

[@tjzx3432]

Incredible, I truly enjoyed this. Especially since it relates to the work I'm doing.

[@ninjoe52]

I haven't seen you in a while! How are ya doin?

[@brusspup]

Doing great, Thanks! It feels good to finally get a video uploaded.

[@epicgamer268]

+brusspup how come you don't post as much anymore

[@Sarahxxx666]

+brusspup And one hell of a video at that ! Very entertaining and interesting, especially the glass turned upside down letting the cold air flow out of it (gravity I guess). Thanks for this piece of art !

[@mattiabragantini1152]

+brusspup where have you been during all this time ? D:

[@IFFrael]

Not quite gravity (it's the same for the cold and hot air). It's more about density.

[@CarloMario]

What´s the technical explanation?

[@chromauk]

As light passes through any object into another object it bends slightly (refraction) based on the materials density. If you heat or cool something you change its density. so if you have a pocket of heated air, then the photon moving in a straight line from the light source to the mirror is bent slightly by the density change. The set up with the lightsource, mirror and razor (to act as a Foucault filter) into a camera is only to magnify the Schlieren effect making it more pronounced.

[@tectzas]

Yaaaah! You're back!

[@Doubleodude]

Dude Its good to see you upload.

[@Armoredarthur]

Dude it's been too long. But I forgive you since your assistant is smoking hot

[@wajihbec1087]

is brusspup a guy or girl?

[@fayediza]

+Wajih bec she isn't a dude

[@tonyhong20]

+Nurel Fayed But in earlier videos a male voice was in the intro and early videos also show some obviously male hands manipulating objects

[@Jason-ty6ds]

+Tony Hong This is his wife

[@Jason-ty6ds]

+JasonPlays Ya'll are horny bastards

[@clementwang9552]

31st HES BACK OMG, THAT ONLY TOOK LIKE 9 MONTHS

[@wapje223]

you misspelled "she"

[@drunkenyeknom]

+Teun Wich it's a guy

[@f.g.e.]

+Teun Wich it's heirs wife, he prefers his identity to be a secret

[@wapje223]

F. G. E. Sci. aaah

[@potato9410]

did you jusT ASSUME BRUSSPUP'S GENDER?!?!!?!??!?!?!??!/11/1//1/??1/!?!?1/?/!?!?!

[@TomMotyka]

Really amazing effect. Thanks for sharing.

[@LEO1WOLF]

Now THAT'S just freakin' COOL!

[@theartsyone7077]

Now I know what to show a religious person when asked "how do we know if air is real? we can't see it" as though to be ironic.

[@GolfShortsTK]

Now I know how to show an atheist, "how do you know atheists are ignorant if you can't see any." I just have to show them this comment.

[@theartsyone7077]

Atheists are ignorant to anyone who uses a single book as evidence. Same thing goes about 4th wave feminism and rape claims. Over all, we're not ignorant over what evidence we understand... That is why much of the poor of us smartasses are depressed knowing religion will never be able to "help" us.

[@theartsyone7077]

tim tk. In all honesty, I am speaking for only myself in the moment. Any other moment is depending on the situation (Like if my asshole fandom is pushing someone to watch MLP)

[@GolfShortsTK]

Pega Butt Understandable. Everything is subjective no matter the circumstances. However the reason for attacking religion (or the generalized ideology) in this video is pretty ignorant. I can make sense of the humor through the comment, but wrong video. Hence why I called you ignorant. Nonetheless it does not matter lol, have a good day.

[@theartsyone7077]

tim tk. Is it really an attack when it's an ignorant question I plan to use this video as a response to? There are so many religious nuts who ask "If we can't see air, it doesn't exist, right?" all because we say we don't believe in a god that has never been seen as a being on the earth's surface.

[@MatanCAE]

1:55 kamehameha fight

[@namenotneeded1754]

That was AMAZIIING ... Awesome Video

[@saintace1northernsoul]

very impressed with the effect . well done .

[@davidschmidt6013]

Your vid is entertaining, no doubt, but I feel it would have more value if you would (if you can) explain the science behind the phenomenon, and give specifics about the focus of the camera on the blade, or mirror, etc. etc. This was all unclear. When the large round disc (I assume it to be the mirror) is viewed normally, it appears white. When the filming is happening, it appears blue. Where is the camera actually pointing? What exactly does the razor blade do? Are you filming a reflection from its surface?...and quite frankly, I think the pink-pong ball (or whatever type it was) gave away some of your tricks. I could imagine it going up and down, but not coming down diagonally, as it did at 1:39 to 1:42. Much more 'artistic' to you, perhaps,to have no narration, but public education is different than public entertainment, and I admit to being biased toward the former. Thanks.

[@easyidle123]

Your comment is well thought out, but you've got it wrong about the ping pong balls thing. Objects floating in an air current can move up and down parallel to the air current, even if gravity should be making it go straight down. I don't entirely understand the physics of it, but it has something to do with the air current on its underside suspending it.

[@davidschmidt6013]

Charles, as I stated in my initial comment, I can certainly understand the ball going up and down parallel to the air-stream, but not diagonally. And I wish the razor blade and focal point of the camera had been explained. A slightly better explanation of these last two topics is offered here: kzbin.info/www/bejne/o33TkKWJd9-nm6s AND THE BEST ONE IS OFFERED HERE: kzbin.info/www/bejne/pnrJZoCHd7GNiZI

[@Loveyou-bb9bg]

Why not instead use your own brain!

[@sandyreijs]

OMG MEISJEDJAMILA

[@PolyMe3]

JAAAAAA toch iemand die het ook opmerkte :D

[@sandyreijs]

Poly Me yaaasss

[@denne8071]

Dit is gwn meisjedjamila

[@sandyreijs]

+Captain Teemo srs😂

[@Syntelman]

The music is fantastic, of course the video too! Cool combination

[@tacosKebab4]

I love music in the background everytime ! I want a 10 hours of that 😍😍😍

[@lorinamohanty]

she composes them herself!

[@matejcernicky5300]

look proved that we have been born as gods that everithing is just energy even if we can´t see it bye our eyes ... insted of growing to full god form , the system is makeing primitive human beings from us

[@ARBB1]

That's fluid dynamics, not spiritual energy. Don't believe in New Age Woo.

[@AtxTrev]

Love beautiful women doing science! Reminds me that some of you use your brain for more than Snapchat.

[@Atulnavadiya]

AtxTrev lol

[@syror5000]

Free speech is allowed, Ian it was you that used the word penis and hard. AtxTrev said beautiful. Seems like you more sick than him.

[@syror5000]

Just as you are freely allowed to express how disgusting his misogyny is. I am freely allowed to express how sick you are. My point is you dont know the man. He just wrote the word beautiful. And from that word you made all the conclusions how misogyny he is, you dont know him at all. Maybe hes a she? or gay? with a picture of he/her boyfriend. Ask your self if you really are helping the world with that statement...

[@samy7342]

AtxTrev agree

[@Streamtronics]

That's what I have subscribed for, this is amazing. Great music as well, thank you.

[@martinblouin3639]

you're crazy man, another super cool vid, as always

[@VPXM2012]

Excellent video, and beautiful example. Thank you for posting this! 👏👏👏 👍

[@naqibah781]

This is really good science explanation

[@bobbykoulouris]

Even though I've seen this a bazillion times the demonstrations were well done.

[@Roobar_Plays]

The music at the beginning was awesome!

[@anothercbrowner]

such an awesome video thanks for posting this!

[@wazowski489]

Brusspups videos always make me have a feeling of wonder, like a child watching a magic show

[@adriankruger2052]

It's so majestic

[@PokemonGo-zy7js]

WOW that's truly amazing

[@lucasalexandre2043]

Amazing video. Congrats

[@arielshikoba1857]

This is freaking amazing 🙌

[@RodrigoPereira-nq3je]

your channel is so good omg.

[@neobeeart9711]

Nice work Brusspup! :D

[@greeninja451]

Thats cool. It shows the heat waves of different objects.

[@kamilavasickova1160]

This was sooo amazing and your hair is really pretty too

[@Dany_23L]

Beautiful video. thank you

[@EKOANTHONY]

great come back.