Why is there a HOLE in AIRPLANE windows?

  • Published on Oct 29, 2016
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    After take-off and during climb, the outside air pressure is in a constant fall, whilst the air pressure within the cabin is in a constant rise created by the aircraft's bleed and air conditioning system, otherwise you would have trouble breathing during the flight. Due to the big difference between the ambient pressure in the cabin and the low pressure outside, there´s is a lot of physical stress on the cabin hull and especially on the windows.
    Now if we take a closer look at the cabin windows you´ll see they are made up out of three separate window panes. One outer and middle pane which share the same window frame and one inner pane.
    Now if you look at your windows installed in your home you´ll see they are also made up out of at least two panes of glass, with a transparent gas in between them, acting as a temperature barrier which stops condensation on the inner side of the window.
    Same in the airplane but without the special gas in between. Because the air pressure difference and temperature variations are far much higher then in your home, engineers had to come up with and idea to prevent the windows from fogging and freezing up. So they´ve decided to leave an air gap in between the two panes. But air has the physical effect of expanding and shrinking either due to air pressure or temperature changes, which could damage the windows.
    See the rest of the video for more information!
  • Science & TechnologyScience & Technology

Comments • 496

  • Vishal Panchal
    Vishal Panchal 12 hours ago

    Joe what is meant by bleed air?

  • AJ Deere T680
    AJ Deere T680 14 days ago

    The first video that I watched from you and immidiatly subbed!

  • Canadian kid
    Canadian kid 15 days ago +1

    Did the stewardess tell you about the hole .....LOL

  • Luka T
    Luka T 29 days ago

    How do cabin pressurization works?

  • CaptainCalm90
    CaptainCalm90 Month ago

    First, I just didn`t understand what is between outer and middle window? Is it transparent gas also, or what kind of air gap is between them? And second, hole is placed on inner window and acts as bleed hole balancing the air pressure differences between inner and middle window, right?

  • Tmanaz480
    Tmanaz480 2 months ago

    How about a video on ECS/Packs, fogging in the cabin, etc. Thanks!!

  • Valentin Stöß
    Valentin Stöß 2 months ago

    I have a short question.
    As there is no seal between inner and mid window, air is constantly flowing out of the cabin.
    Therefore the AC (or other system) has to pump air into the cabin the maintain constant pressure.
    Can that pressure be adjusted somewhere, and if yes, would that be the reason why on some flights the ears hurt and it's necessary to perfom pressure equalization ??
    (as there would be a difference in the ammount of air that enters and leaves the cabin respective for over- and underpressure)

  • Lo Ranger
    Lo Ranger 2 months ago

    My house is a grade 2 star listed building so the window only has 1 thin layer of glass

    RENEHIKO 2 months ago

    learned something again

  • academy.jccbi.gov.catalogue


  • academy.jccbi.gov.catalogue


  • man of the woods
    man of the woods 2 months ago

    Joe, on behalf of all the normal passengers, I apologize for all the eager and annoying people who take off belts as soon as plane lands or even start walking around the cabin :(

  • Stay Calm
    Stay Calm 3 months ago

    So what about the oxygen supply at really high altitude? does that hole not lead to leaking of oxygen through it? then there is surely need of extra oxygen supply which is wastage of oxygen through this hole. please explain

  • sku
    sku 3 months ago

    Hey Captain Joe, your video is part of the article on the one of the major Serbian news web site www.b92.net/putovanja/zanimljivosti.php?yyyy=2018&mm=08&dd=21&nav_id=1433246 :)

    LITTLEEPICMAN 3 months ago

    these videos really help me with becoming an airline pilot

  • Crusher Rakib
    Crusher Rakib 3 months ago

    What if i put my hand in that hole and stop that

  • Greymation
    Greymation 3 months ago

    1:09 In the US, we don't have many homes that have layered windows.

  • mark675
    mark675 3 months ago

    So dont hold your finger over it for the whole flight 😂

  • its melenigma
    its melenigma 4 months ago

    Why does airbus use joysticks

  • The Auto Hot-Shot
    The Auto Hot-Shot 5 months ago

    I thought you might of mentioned why the windows are oval instead of square like they were on the earliest aircraft and why they had to change the design. However another great video and more to my education on aviation. Thank You Captain Joe

  • Ritesh Kakkar
    Ritesh Kakkar 5 months ago

    nice black boards

  • Jarek Jellison
    Jarek Jellison 6 months ago

    I think this is just with Airbus aircraft. Cause on Boeings, which is what I primarily fly on, there is not a hole.

  • Bibhusit Adhikari
    Bibhusit Adhikari 6 months ago

    Why is Flaps and Slats used for?

  • DelBoy
    DelBoy 6 months ago

    how doesn't your balls weigh the plane down? fucking flying 30,000 in the sky in a shitty piece of aluminium lol

  • ally lasrado
    ally lasrado 6 months ago

    Cap Joe,your videos tend to be half the length of mentor 360.

  • Mick 92
    Mick 92 6 months ago

    You overestimate the technology of my house's windows.
    Then again, I'm familair with double panel windows, so no problem there.

  • gamer3928
    gamer3928 6 months ago

    what happens if you plug the hole?

  • MisterTofu
    MisterTofu 6 months ago

    You could make a video about where you get the air on a plane or why there are steam in the cabin sometimes.

  • Llama Narwhal
    Llama Narwhal 6 months ago

    8.1k likes and 81 dislikes.

  • Nishant Thakur
    Nishant Thakur 7 months ago

    its funny if he told all the passengers to subscribe his channel or he'll crash this plane xD

  • Krzysztof Toloczko
    Krzysztof Toloczko 7 months ago

    You wanna blow up boi?

  • Booga04 Minecraft
    Booga04 Minecraft 7 months ago

    Wow your videos are so cool!

  • Steve-O54
    Steve-O54 7 months ago

    South West is asking the same question

  • Technical Sat7
    Technical Sat7 7 months ago

    Sir how check swinging and loop swinging has done..?

  • TKTV
    TKTV 7 months ago

    Captain Joe, Your episodes are interesting and have upgraded my knowledge on Aircraft design. I have installed a live flight feeder for Flightaware company which provides flight data to the airlines and ATC world wide. Thanks for your short videos on aircrafts.

  • Lisa Fortnite
    Lisa Fortnite 7 months ago

    What company do you work for

    • Dylan
      Dylan 3 months ago

      Lisa Fortnite Cargolux

  • Tiwaking Tiwaking
    Tiwaking Tiwaking 7 months ago +5

    1:14 there is no double glazing in my house

  • TheOnePistol
    TheOnePistol 7 months ago

    So that's why there's always a little bit of frost by that hole mid flight.

  • cup to you
    cup to you 7 months ago

    Why do planes have wings

    • Dylan
      Dylan 3 months ago

      cup to you So they can fly

  • tinyiko baloyi
    tinyiko baloyi 8 months ago

    never notice that small hole. thanx

  • CadenOnYT
    CadenOnYT 8 months ago

    Theres no hole in the airplane im using

  • Aakash
    Aakash 8 months ago

    Justin Trudeau is a pilot now?
    😀 Jk Joe, great video as always!

  • NorlandCycles
    NorlandCycles 8 months ago

    how does it work the curtain system on cabin windows? how come when they are closed the fuselage looks so smooth, without the glass distortion?

  • STUDENT William Baumstark

    Your a strait up G

  • Aaron Carrier
    Aaron Carrier 8 months ago

    Do the windows flex?

  • Alex BUSH
    Alex BUSH 8 months ago

    The howl is in the middle pain

  • KìÁĐ
    KìÁĐ 8 months ago

    Summary air pressure

  • abhinav singh tawar
    abhinav singh tawar 9 months ago

    Captain. Make a video on how does dimmable windows work. TYSM

  • Dmitry Kim
    Dmitry Kim 9 months ago

    What if a terrorist will block all window holes on the plane, will ot crash?

  • Huzefa ali Shaikh
    Huzefa ali Shaikh 9 months ago

    Joe why are airplanes window oval??

  • Jan Vogels
    Jan Vogels 9 months ago

    I may have become addicted to these videos.

  • Lowlife Garage
    Lowlife Garage 9 months ago

    What if you cover the hole

    TRINITYADAMS69 9 months ago

    Very cool. Never noticed the little hole. Learned something new today which is awesome.

  • Aniruddha Mukherjee
    Aniruddha Mukherjee 9 months ago

    Your videos are v gud....

  • arda şimşek
    arda şimşek 9 months ago

    but thanks great explanation

  • arda şimşek
    arda şimşek 9 months ago +1

    you arent captain you are first officer

  • Abdul Barr Ibn Zaker
    Abdul Barr Ibn Zaker 9 months ago

    2:22 :Ohhh. :) Last time when I was on an airplane, I was like "Why are these windows made out of plastic??" xD

  • FoxtrotVX
    FoxtrotVX 10 months ago

    So what if the outer pane is breeched? That hole ought to bleed air out of the plane. I mean the plane is probably designed to be able to maintain positive pressure in the event of a breech, but isn't there a more effective method to doing this?

  • Robert Smith
    Robert Smith 10 months ago

    Wouldn't it be funny if captain Joe is just a guy that knows a lot of random facts about planes and not even a captain at all??

  • Khương Huỳnh Quốc
    Khương Huỳnh Quốc 10 months ago

    What would happen if someone tries to cover the little hole by something: tape, for instance?

  • Souria Murthy
    Souria Murthy 10 months ago

    Captain Frank Lampard

  • KS Wasif
    KS Wasif 10 months ago

    What is the common language spoken in air traffic control

  • Rajwardhan Sagare
    Rajwardhan Sagare 10 months ago

    hey captain will my window become foggy if I put my thumb on the hole

  • angijuan
    angijuan 10 months ago

    What a cool channel!!! 😄

  • Vivax Solutions
    Vivax Solutions 10 months ago

    What happens If I cover the hole

  • Luke Dawson
    Luke Dawson 11 months ago

    At airports in Australia, the taxi follow lights guiding to the runways they change different colours from green to blue then and again. Why is that?

  • Neba Kolman
    Neba Kolman 11 months ago

    Captain can a boaring pilot flight an Airbus or concord plane

  • Neba Kolman
    Neba Kolman 11 months ago

    Ha captain I really enjoy your videos they are a great source of motivation to me who wished to become a pilot thanks alote and may GOD continues to bless you

  • TheBostonstapler
    TheBostonstapler 11 months ago

    what if i block this hole with my thumb the whole ride along ?

  • Andrew Whang
    Andrew Whang 11 months ago

    What is trim

  • LM Bro
    LM Bro 11 months ago

    For a start he is a commander he only has three stripes

  • Akhil Ponnaluri
    Akhil Ponnaluri 11 months ago

    hi Joe. can you explain what is cabin pressure and it's importance...

  • kevin_nahuel2010
    kevin_nahuel2010 11 months ago

    why is there a HOLE IN MY LEFT WING

  • you & me
    you & me 11 months ago

    Joe a question
    What is the speed of an aircraft..
    Which is the best airline ...

    • Ozan Akdag
      Ozan Akdag 11 months ago

      Average speed is around 900-1000 km/h.

  • Capitão Explosão
    Capitão Explosão 11 months ago

    I love your vids but i have a question:
    Arent you a first officer mr. Joe?

  • Bart Volgers
    Bart Volgers 11 months ago

    Hi Joe. There is a small error in this video.
    After take off the cabin pressure is not rising, but also decreasing. But is it is decreasing much slower than the outside pressure. Why not stabilise the cabin pressure to the same as the ground level? In that case on causing altitude the hull has more differential pressure to deal with. So the hull shook be stronger, which makes the aircraft heavier more costly and it burns more fuel. So the air cabine pressure is also lowered when ascending. making the differential persure a bit lower. This way the weight of the hull can be made thinner, the plain lighter and more economically.
    I am so enjoying your channel :-) It's so much fun learning about aviation in every video. Can you make video about the process of starting the engines. What happens in the engines. Are they started electrical like in a car? Are the started with compressed air? What preparations are needed before start?
    Safe flights and hop to meet you in real live!

  • anton notna
    anton notna Year ago


  • Jamaluddin Shaikh

    Hello Joe sir....why the passenger windows are not in the perfect square shape?

    • Ozan Akdag
      Ozan Akdag 11 months ago +1


  • Natasnow
    Natasnow Year ago

    So?? can I safely stick my penis in it?

  • commanderbluy
    commanderbluy Year ago

    I actually learnt about my home windows in this video. Mine are single glass pane. It explains why I get condensation on cold mornings! Thank you Joe!

  • K Digital Production Services

    Captain Joe!!! What are aerolons?? ailirons!! Gosh.... Ailerons Yes!!! What are those??

  • Shalin Shah
    Shalin Shah Year ago

    Not all of us can afford double glazed 😂😂. But yeah I get the point I'm not tryna argue or anything.

  • Qadri2323 Q
    Qadri2323 Q Year ago

    God bless you, you have amazingly good personality

    JAMES COLON Year ago

    Captain joe what is retard?

  • Loutral
    Loutral Year ago

    You can actually see a similiar hole in Bic pens. I think it's also for pressure reasons.

  • Jay Jay Smith
    Jay Jay Smith Year ago

    Soo many questions answered. Gracias capitan!

  • sai khasim
    sai khasim Year ago

    why pilots say mayday in an emergency?plz explain captain joe

  • Borut Goli
    Borut Goli Year ago

    Sorry but how can cabin pressure be in constant raise? Cabin pressure stays the same, actualy if I am not mistaken cabin air pressure is set to be round 800 mbar, while ambient air pressure at 11.000 meters is round 200 mbars. So ambient air pressure drops from 1000 mbar (at sea level) to 200 mbar while cabin air pressure drops from 1000 mbar to 800 mbar. 800mbar is enough for most people not to have any physical problems and at the same time present way lower physical stress to the cabin frame than 1000mbar cabin pressure would.

  • inayathkhan mohammed

    Sir Joe! Great explanation

  • shaji kampurath
    shaji kampurath Year ago

    You are superb bro

  • Rocksmith Pdl
    Rocksmith Pdl Year ago

    Im doing aerospace engineering course i find ur videos very interesting and knowledgable for me

  • The future world
    The future world Year ago

    thanks for video

  • 89 Alpha
    89 Alpha Year ago +1

    SOoo what happens if i leave my finger or put some gum on the hole before take off ?

  • Notausstieg0309
    Notausstieg0309 Year ago

    Hey Joe, what is the correct german translation for drain masts? Im totally stuck. Thanks

  • Butter Finger
    Butter Finger Year ago

    What if i cover the hole with my finger ??

  • Rich Hero
    Rich Hero Year ago

    what if we put our finger on it

  • Robert Goff Jr
    Robert Goff Jr Year ago

    Great videos, I have a question, who takes over flying when the pilot gets tired on the 8hr and above direct flights, are there extra crew members onboard to swap out?

  • Timothy James Herman Miraflor

    Question, Do you need to be Good at Math if you want to become a pilot?

  • Jaive 75
    Jaive 75 Year ago

    I like your videos Joe 😃😃

    WNDW ST IDN Year ago

    I never see this damn hole when flying on Boeing planes, just outer window.