SCIENCE CLASS #2- Does Farting Make You Weigh Less?

This is a juicy one. 70% people get this one wrong. I stream science LIVE M-W-F 1pm PT.



  1. Mark Rober

    Mark RoberPrije godine

    I stream science LIVE M-W-F at 1pm PT. Thanks for being here!

  2. Johny Hoare

    Johny HoarePrije 12 dana

    By making the metal less comoact

  3. Malakai Thompson

    Malakai ThompsonPrije 3 mjeseci

    I think the shape of the bottom is why it doesn't float - Malakai (6)

  4. Isu

    IsuPrije 3 mjeseci

    you are welcome :

  5. Balboa Rocky

    Balboa RockyPrije 3 mjeseci


  6. Kittenz Iwnl

    Kittenz IwnlPrije 5 mjeseci

    @William Pantel look no o

  7. tall32guy

    tall32guyPrije 5 sati

    So funny! Mark you are such a goofy (and cute) guy! :)

  8. Lindsay Thiel

    Lindsay ThielPrije 8 dana

    Is that how boats are able to stay up mark?!!??!??!!!?

  9. Brian Lane

    Brian LanePrije 11 dana

    I have a hard time believing the answer is quite this simple. You aren’t taking into consideration the compression effect your body might have on the gases inside of it. It might be negligible, but, it surely counts for something

  10. Milton Sierra

    Milton SierraPrije 12 dana

    We did this in sixth grade everything he did in clue one we learned in sixth

  11. mod miiwii

    mod miiwiiPrije 13 dana

    I played does it float or sink with my moms phone and now she is mad at me for some reason. I told he it was an important scientific study.

  12. Eu C

    Eu CPrije 16 dana

    Maybe you put a can over it to make the heavy chunk of metal float? Just guessing.

  13. Eu C

    Eu CPrije 16 dana

    Oh my gosh I was wrong XD

  14. cassandra

    cassandraPrije 16 dana

    It certainly feels that way.

  15. Alex _ IsBroken

    Alex _ IsBrokenPrije 17 dana

    7:15 Is it just me or did he say something else that wasn't "ships...?" :'>

  16. jamcdonald120

    jamcdonald120Prije 19 dana

    29:30 I have a 20 year plan, but I am the only one I know who does, and I didnt come up with it until my last year of college.

  17. jamcdonald120

    jamcdonald120Prije 19 dana

    3:55 make a boat?

  18. Jory Potts

    Jory PottsPrije 19 dana

    Great job Mark you make it easy for us to watch thank thank you thank you

  19. 林宸毅Jayden

    林宸毅JaydenPrije 20 dana

    so there are no gasses

  20. J.P. Sayer

    J.P. SayerPrije 20 dana

    This is a class where you teach the concepts mass vs weight

  21. Charles Brouillette

    Charles BrouillettePrije 20 dana

    Every time mark said ocean of air I kept thinking of the song “ astronaut in an ocean”

  22. StupidSwine

    StupidSwinePrije 21 dan

    "its not a skirt its a skilt" ☠️

  23. ShadowClaw357

    ShadowClaw357Prije 25 dana

    Mark Rober would be the best physics teacher everrrr! I wish I could have him

  24. Stewka

    StewkaPrije 27 dana

    By flattening the metal and widen the area?

  25. Quintin Sargento

    Quintin SargentoPrije 27 dana

    I farted 11 times during this video. Too bad I didn’t lose any weight :(

  26. Marky Zukowski

    Marky ZukowskiPrije 27 dana

    Gas is a certain type of air so it weighs nothing so no

  27. Miss Gnoamer

    Miss GnoamerPrije 27 dana

    Expelling flatulence causes the human body to change volume… less gas equals less volume… therefore, as gas is released the density of of the human body increases… so yes, you weigh more after you expel flatulence.

  28. Kenza Rezyarifin

    Kenza RezyarifinPrije mjesec

    Best science teacher

  29. Comit

    ComitPrije mjesec

    I actually got 100% on the "will it float" segment!!

  30. dirtrider88

    dirtrider88Prije mjesec

    0:25 wonder how many people caught the joke. and while im 25 seconds in im gonna say no, it makes you weight more

  31. Chris Harrison

    Chris HarrisonPrije mjesec

    I've been telling people this for years and they rarely believe me! I'm so glad I can finally back that up by showing them this video!

  32. Internet Troll

    Internet TrollPrije mjesec

    Make a tin foil boat

  33. Internet Troll

    Internet TrollPrije mjesec

    Or does losing some hot air make you weigh more?

  34. Eashan Kakulla

    Eashan KakullaPrije mjesec

    8:07 is float.

  35. killakira12

    killakira12Prije mjesec

    So we kinda like balloons? If we let the smelly air out we become heavier. Just like balloons.

  36. Cali Foxworth

    Cali FoxworthPrije mjesec

    Are you live right now?

  37. Glenn Quagmire

    Glenn QuagmirePrije mjesec


  38. Frost

    FrostPrije mjesec

    so if fart a tons of time in a ballon its gonna float !!! lol

  39. killakira12

    killakira12Prije mjesec

    Yes lol

  40. Red Gum

    Red GumPrije mjesec

    Depending on the liquid or gas you are in

  41. Andrew Walkington

    Andrew WalkingtonPrije mjesec

    It doesn't matter how many life jackets you put on some people, you can't make them less dense...

  42. Robin Kessler-Braun

    Robin Kessler-BraunPrije mjesec

    i love your videos

  43. Herb Molina

    Herb MolinaPrije mjesec

    It floats

  44. Jim Shepherd

    Jim ShepherdPrije mjesec

    Technically, "weight" is mass x gravity. When you fart, you lose some mass, ergo you weigh less. What you're actually saying here is that we become more dense when we fart, and therefore the resultant force of gravity vs buoyancy is greater in the direction of buoyancy, hence why the scales would show you as "heavier". But you're still losing weight when you fart.

  45. YourBuddyYasin

    YourBuddyYasinPrije mjesec

    Mark, thank you for this video because you answered my 7 year old minds question. Keep on going dude!

  46. Pék Backer

    Pék BackerPrije mjesec

    3:25 lol :D

  47. Braxten Rager

    Braxten RagerPrije mjesec


  48. Evan Sisco

    Evan SiscoPrije 2 mjeseci

    more mass via the shape

  49. Catal

    CatalPrije 2 mjeseci

    Best Teacher Ever

  50. Angel Jonguitud

    Angel JonguitudPrije 2 mjeseci


  51. Salim Ibrahim

    Salim IbrahimPrije 2 mjeseci


  52. Keren Liila

    Keren LiilaPrije 2 mjeseci

    These videos are short My science class last 70 mins

  53. Abigayle Gaming

    Abigayle GamingPrije 2 mjeseci

    This was 1 year ago

  54. Daniel Reads

    Daniel ReadsPrije 2 mjeseci

    Thanks so much for the life advice too!

  55. Steven Thompson

    Steven ThompsonPrije 2 mjeseci

    Oh that’s why wrestlers grunt a lot, they are trying to fart so they can weigh more to gain some power over their opponents

  56. Marcus Wildey

    Marcus WildeyPrije 2 mjeseci

    It’s funny that yes you weigh more but you have less mass just think about that for a moment

  57. Natalie Mishoe

    Natalie MishoePrije 2 mjeseci

    I am 43 and loving this. I wish I would have had a teacher like him. Mark make sure you do stuff like this in your high school class room bc it makes all the difference

  58. Miss Wendy Jane

    Miss Wendy JanePrije 2 mjeseci

    I don't want to eat a lot of beans to find out - can someone just confirm the answer?

  59. Federal Noob association

    Federal Noob associationPrije 2 mjeseci

    My guess for the "Why the sky is blue" The sky reflects off the ocean and probably has to do something with atmosphere changes it I think.

  60. Greg Sullivan

    Greg SullivanPrije 2 mjeseci

    My employer coerced me into teaching an evening class at a local JC. The subject was Printed Circuit Board production - drilling and routing. I dreaded the thought. Thankfully I had taken a speech class in college so I at least had a clue on how to talk to 45 people. It turned out that I actually enjoyed the "give and take" between myself and the students. It was more rewarding than I expected.

  61. Jesus Stout

    Jesus StoutPrije 2 mjeseci

    Awesome educational video

  62. Reptilian Apple Salesman

    Reptilian Apple SalesmanPrije 2 mjeseci

    Nursing home answer: Ethel! Where are my teeth?!?

  63. Heather Smiliekiwi

    Heather SmiliekiwiPrije 2 mjeseci

    Except a Ted talk tells you fat leaves your body via air. I don’t know who to believe...

  64. Donald Duck 82 2.0

    Donald Duck 82 2.0Prije 2 mjeseci

    Its grown up so fast 1 year

  65. Dragon Tail

    Dragon TailPrije 2 mjeseci

    Gonna hold my farts from now on

  66. Josh Wallis

    Josh WallisPrije 2 mjeseci

    So what was the answer to the title of the video?

  67. Ryan Hannigan

    Ryan HanniganPrije 2 mjeseci

    The fine step-aunt fortuitously exercise because wrinkle virtually step outside a elastic carrot. nonstop, talented babies

  68. Mike 808

    Mike 808Prije 2 mjeseci

    "The earth moves underneath ever so slightly" when jumping, - according to the model it moves at 15° an hour which would mean it is rotating at about 1000 miles an hour at the equator. I guess ever so slightly is subjective

  69. Giorgi Tsiklauri

    Giorgi TsiklauriPrije 2 mjeseci

    But are farts not under compression in the bowel?

  70. fulSTakk

    fulSTakkPrije 2 mjeseci

    I mean, give this man what he needs to become a teacher. He'll be the coolest high school teacher in North America.

  71. A UGUST

    A UGUSTPrije 2 mjeseci

    where's one of your 1st youtube videos you said you would put in the comments below (25mins 22secs)

  72. adriancombe

    adriancombePrije 2 mjeseci

    That is totally not where I thought you were going with this, right up to the end. I was thinking in terms of how the flatulence originates, which is decomposing organic matter. Before it decomposes, it is solid. Once it becomes gas, it can leave the body. So if you compare the weight before the decomposition to the weight after, all other things being equal, you weigh less. But if you don't measure weight until after the digested food has decomposed, then of course the buoyancy is the driving principle.

  73. Federal Noob association

    Federal Noob associationPrije 2 mjeseci

    Ayyyyy welcomd

  74. Nicoolio

    NicoolioPrije 2 mjeseci

    I would relive the horrible experience that was high school just to have Mark Rober as my physics teacher

  75. TheLostArceus

    TheLostArceusPrije 2 mjeseci

    He had the chance to throw rose in the ocean and didn't. Idk what to make of this.

  76. Randolph Torres

    Randolph TorresPrije 3 mjeseci

    OOOPS Just gained some weight!! So that’s why girls don’t fart.

  77. moneyblackblood

    moneyblackbloodPrije 3 mjeseci

    This is awesome! Often my farts feel highly pressurized. Is it possible that if I packed enough fart into a small colon the density of said fart would be greater inside me than that of the air around me?

  78. jeff buck

    jeff buckPrije 3 mjeseci

    will the results b the same in a vacuum?

  79. Nathan Hazzard

    Nathan HazzardPrije 3 mjeseci

    to make something nutraly boyent cant you just caculate the desity of both the block of wood and the bucket of water (mass over volume) and make them the same

  80. Boni S

    Boni SPrije 3 mjeseci

    Hahahaha 20:48 😂

  81. Kyla parkinson

    Kyla parkinsonPrije 3 mjeseci

    No farting does not make you weigh less, because a fart is a gas which is just stored inside your stomach so when you fart gas weighs nothing becuase its almost air but they have differences but air weighs nothing and thats onr thing gas and air have in common. So technically no farting does not make you weigh less

  82. michael revels

    michael revelsPrije 3 mjeseci

    Man I'm still watching this video to see what he says, geez man a simple yes or no would be great. I'm assuming mathematically speaking it has to make you weight less it's less of something less of something means less you, right.

  83. Khalid Ahmed

    Khalid AhmedPrije 3 mjeseci

    your the best youtuber

  84. Patricia Anguiano

    Patricia AnguianoPrije 3 mjeseci

    Mark: it isn’t that easy Me: OH NO! ITS IMPOSSIBLE!

  85. Standard Built

    Standard BuiltPrije 3 mjeseci

    POV: You yelled at a dude who worked for NASA because he used weight instead of mass for density. Then seconds later he addresses it.

  86. Theron Trickshots

    Theron TrickshotsPrije 3 mjeseci

    I always watch one of these videos to help encourage me when I'm cycling at home

  87. Zanna

    ZannaPrije 3 mjeseci


  88. Zanna

    ZannaPrije 3 mjeseci


  89. Zanna

    ZannaPrije 3 mjeseci

    make a metal boat

  90. Zanna

    ZannaPrije 3 mjeseci

    You will weigh more.

  91. Mullvaden83

    Mullvaden83Prije 3 mjeseci

    Im gonna go to school again just to have Mark Rober as teacher. XD

  92. 1K subbs with awesome videos

    1K subbs with awesome videosPrije 3 mjeseci

    Depends on how many farts you take out.While only 1 fart weighs 0 pounds, a lot more will weigh more, and while the farts are inside you, you weigh more.When you get them out, that weight gets out, and you weigh less.

  93. Speedcuber975

    Speedcuber975Prije 3 mjeseci

    So before even clicking on this video I had a whole thought process of “well considering that gas is trapped inside you, it should technically be helping you in the direction of being lighter the same way helium makes a balloon go up instead of weigh more. So getting rid of it technically makes you weigh more, Like a balloon loosing some of its helium wouldn’t float as high. This comment was written before watching the video at all so we’ll see if I’m right.

  94. Deval Maheshwari

    Deval MaheshwariPrije 3 mjeseci

    I was waiting for lord watermelon to appear

  95. Carmen Yeung

    Carmen YeungPrije 3 mjeseci

    I'm 32, and I just had a WHAT?! moment, Thank you.

  96. OpticFN 父

    OpticFN 父Prije 3 mjeseci

    This guy explains stuff more clearly than my Science teacher....

  97. Epic Boi

    Epic BoiPrije 3 mjeseci

    What's making him not pop is that there is no idiots screaming in class.

  98. Duke Pfeiffer

    Duke PfeifferPrije 3 mjeseci

    Make a bubble of metal it will float

  99. Ebad Rahman

    Ebad RahmanPrije 3 mjeseci

    Tin foil boat Edit: ye I got it, mad

  100. Roblox player

    Roblox playerPrije 3 mjeseci

    Awwwe mark loves playing with his dolls lol

  101. zZILLAa 2

    zZILLAa 2Prije 3 mjeseci

    #1 Density 2:30 #2 Boiancy 13:10 #3 Gas is less dense than air. 17:10 #4 summerisation 17:39

  102. hoon tae

    hoon taePrije 3 mjeseci

    The agreeable mistake largely burn because capital morally warm following a joyous population. warlike, insidious afghanistan

  103. ImJustSnipeHunting

    ImJustSnipeHuntingPrije 3 mjeseci

    I totally thought this was live right now.

  104. ImJustSnipeHunting

    ImJustSnipeHuntingPrije 3 mjeseci

    Why do witches float?

  105. ImJustSnipeHunting

    ImJustSnipeHuntingPrije 3 mjeseci

    Make a boat

  106. Isu

    IsuPrije 3 mjeseci

    i just did density like 2 days ago in my school and my teacher couldnt explain me that in 60 mins but mark explained to me in 10 mins:)

  107. Isu

    IsuPrije 3 mjeseci

    if he was my teacher i would be willing to go to school