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.


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

    Mark RoberMark RoberAasta tagasi
    • By making the metal less comoact

      Johny HoareJohny Hoare11 päeva tagasi
    • I think the shape of the bottom is why it doesn't float - Malakai (6)

      Malakai ThompsonMalakai Thompson3 місяці tagasi
    • you are welcome :

      IsuIsu3 місяці tagasi
    • Ok

      Balboa RockyBalboa Rocky3 місяці tagasi
    • @William Pantel look no o

      Kittenz IwnlKittenz Iwnl5 місяців tagasi
  • Is that how boats are able to stay up mark?!!??!??!!!?

    Lindsay ThielLindsay Thiel7 päeva tagasi
  • 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

    Brian LaneBrian Lane9 päeva tagasi
  • We did this in sixth grade everything he did in clue one we learned in sixth

    Milton SierraMilton Sierra11 päeva tagasi
  • 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.

    mod miiwiimod miiwii12 päeva tagasi
  • Maybe you put a can over it to make the heavy chunk of metal float? Just guessing.

    Eu CEu C14 päeva tagasi
    • Oh my gosh I was wrong XD

      Eu CEu C14 päeva tagasi
  • It certainly feels that way.

    cassandracassandra15 päeva tagasi
  • 7:15 Is it just me or did he say something else that wasn't "ships...?" :'>

    Alex _ IsBrokenAlex _ IsBroken15 päeva tagasi
  • 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.

    jamcdonald120jamcdonald12017 päeva tagasi
  • 3:55 make a boat?

    jamcdonald120jamcdonald12017 päeva tagasi
  • Great job Mark you make it easy for us to watch thank thank you thank you

    Jory PottsJory Potts18 päeva tagasi
  • so there are no gasses

    林宸毅Jayden林宸毅Jayden19 päeva tagasi
  • This is a class where you teach the concepts mass vs weight

    J.P. SayerJ.P. Sayer19 päeva tagasi
  • Every time mark said ocean of air I kept thinking of the song “ astronaut in an ocean”

    Charles BrouilletteCharles Brouillette19 päeva tagasi
  • "its not a skirt its a skilt" ☠️

    StupidSwineStupidSwine19 päeva tagasi
  • Mark Rober would be the best physics teacher everrrr! I wish I could have him

    ShadowClaw357ShadowClaw35724 päeva tagasi
  • By flattening the metal and widen the area?

    StewkaStewka25 päeva tagasi
  • I farted 11 times during this video. Too bad I didn’t lose any weight :(

    Quintin SargentoQuintin Sargento25 päeva tagasi
  • Gas is a certain type of air so it weighs nothing so no

    Marky ZukowskiMarky Zukowski25 päeva tagasi
  • 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.

    Miss GnoamerMiss Gnoamer26 päeva tagasi
  • Best science teacher

    Kenza RezyarifinKenza RezyarifinМісяць tagasi
  • I actually got 100% on the "will it float" segment!!

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

    dirtrider88dirtrider88Місяць tagasi
  • 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!

    Chris HarrisonChris HarrisonМісяць tagasi
  • Make a tin foil boat

    Internet TrollInternet TrollМісяць tagasi
  • Or does losing some hot air make you weigh more?

    Internet TrollInternet TrollМісяць tagasi
  • 8:07 is float.

    Eashan KakullaEashan KakullaМісяць tagasi
  • So we kinda like balloons? If we let the smelly air out we become heavier. Just like balloons.

    killakira12killakira12Місяць tagasi
  • Are you live right now?

    Cali FoxworthCali FoxworthМісяць tagasi
  • no

    Glenn QuagmireGlenn QuagmireМісяць tagasi
  • so if fart a tons of time in a ballon its gonna float !!! lol

    FrostFrostМісяць tagasi
    • Yes lol

      killakira12killakira12Місяць tagasi
  • Depending on the liquid or gas you are in

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

    Andrew WalkingtonAndrew WalkingtonМісяць tagasi
  • i love your videos

    Robin Kessler-BraunRobin Kessler-BraunМісяць tagasi
  • It floats

    Herb MolinaHerb MolinaМісяць tagasi
  • 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.

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

    YourBuddyYasinYourBuddyYasinМісяць tagasi
  • 3:25 lol :D

    Pék BackerPék BackerМісяць tagasi
  • hi!

    Braxten RagerBraxten RagerМісяць tagasi
  • more mass via the shape

    Evan SiscoEvan SiscoМісяць tagasi
  • Best Teacher Ever

    CatalCatalМісяць tagasi
  • :)

    Angel JonguitudAngel Jonguitud2 місяці tagasi
  • NO

    Salim IbrahimSalim Ibrahim2 місяці tagasi
  • These videos are short My science class last 70 mins

    Keren LiilaKeren Liila2 місяці tagasi
  • This was 1 year ago

    Abigayle GamingAbigayle Gaming2 місяці tagasi
  • Thanks so much for the life advice too!

    Daniel ReadsDaniel Reads2 місяці tagasi
  • 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

    Steven ThompsonSteven Thompson2 місяці tagasi
  • It’s funny that yes you weigh more but you have less mass just think about that for a moment

    Marcus WildeyMarcus Wildey2 місяці tagasi
  • 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

    Natalie MishoeNatalie Mishoe2 місяці tagasi
  • I don't want to eat a lot of beans to find out - can someone just confirm the answer?

    Miss Wendy JaneMiss Wendy Jane2 місяці tagasi
  • 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.

    Federal Noob associationFederal Noob association2 місяці tagasi
  • 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.

    Greg SullivanGreg Sullivan2 місяці tagasi
  • Awesome educational video

    Jesus StoutJesus Stout2 місяці tagasi
  • Nursing home answer: Ethel! Where are my teeth?!?

    Reptilian Apple SalesmanReptilian Apple Salesman2 місяці tagasi
  • Except a Ted talk tells you fat leaves your body via air. I don’t know who to believe...

    Heather SmiliekiwiHeather Smiliekiwi2 місяці tagasi
  • Its grown up so fast 1 year

    Donald Duck 82 2.0Donald Duck 82 2.02 місяці tagasi
  • Gonna hold my farts from now on

    Dragon TailDragon Tail2 місяці tagasi
  • So what was the answer to the title of the video?

    Josh WallisJosh Wallis2 місяці tagasi
  • The fine step-aunt fortuitously exercise because wrinkle virtually step outside a elastic carrot. nonstop, talented babies

    Ryan HanniganRyan Hannigan2 місяці tagasi
  • "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

    Mike 808Mike 8082 місяці tagasi
  • But are farts not under compression in the bowel?

    Giorgi TsiklauriGiorgi Tsiklauri2 місяці tagasi
  • I mean, give this man what he needs to become a teacher. He'll be the coolest high school teacher in North America.

    fulSTakkfulSTakk2 місяці tagasi
  • where's one of your 1st youtube videos you said you would put in the comments below (25mins 22secs)

    A UGUSTA UGUST2 місяці tagasi
  • 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.

    adriancombeadriancombe2 місяці tagasi
  • Ayyyyy welcomd

    Federal Noob associationFederal Noob association2 місяці tagasi
  • I would relive the horrible experience that was high school just to have Mark Rober as my physics teacher

    NicoolioNicoolio2 місяці tagasi
  • He had the chance to throw rose in the ocean and didn't. Idk what to make of this.

    TheLostArceusTheLostArceus2 місяці tagasi
  • OOOPS Just gained some weight!! So that’s why girls don’t fart.

    Randolph TorresRandolph Torres3 місяці tagasi
  • 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?

    moneyblackbloodmoneyblackblood3 місяці tagasi
  • will the results b the same in a vacuum?

    jeff buckjeff buck3 місяці tagasi
  • 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

    Nathan HazzardNathan Hazzard3 місяці tagasi
  • Hahahaha 20:48 😂

    Boni SBoni S3 місяці tagasi
  • 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

    Kyla parkinsonKyla parkinson3 місяці tagasi
  • 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.

    michael revelsmichael revels3 місяці tagasi
  • your the best youtuber

    Khalid AhmedKhalid Ahmed3 місяці tagasi
  • Mark: it isn’t that easy Me: OH NO! ITS IMPOSSIBLE!

    Patricia AnguianoPatricia Anguiano3 місяці tagasi
  • 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.

    Standard BuiltStandard Built3 місяці tagasi
  • I always watch one of these videos to help encourage me when I'm cycling at home

    Theron TrickshotsTheron Trickshots3 місяці tagasi
  • float

    ZannaZanna3 місяці tagasi
  • float

    ZannaZanna3 місяці tagasi
  • make a metal boat

    ZannaZanna3 місяці tagasi
  • You will weigh more.

    ZannaZanna3 місяці tagasi
  • Im gonna go to school again just to have Mark Rober as teacher. XD

    Mullvaden83Mullvaden833 місяці tagasi
  • 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.

    1K subbs with awesome videos1K subbs with awesome videos3 місяці tagasi
  • 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.

    Speedcuber975Speedcuber9753 місяці tagasi
  • I was waiting for lord watermelon to appear

    Deval MaheshwariDeval Maheshwari3 місяці tagasi
  • I'm 32, and I just had a WHAT?! moment, Thank you.

    Carmen YeungCarmen Yeung3 місяці tagasi
  • This guy explains stuff more clearly than my Science teacher....

    OpticFN 父OpticFN 父3 місяці tagasi
  • What's making him not pop is that there is no idiots screaming in class.

    Epic BoiEpic Boi3 місяці tagasi
  • Make a bubble of metal it will float

    Duke PfeifferDuke Pfeiffer3 місяці tagasi
  • Tin foil boat Edit: ye I got it, mad

    Ebad RahmanEbad Rahman3 місяці tagasi
  • Awwwe mark loves playing with his dolls lol

    Roblox playerRoblox player3 місяці tagasi
  • #1 Density 2:30 #2 Boiancy 13:10 #3 Gas is less dense than air. 17:10 #4 summerisation 17:39

    zZILLAa 2zZILLAa 23 місяці tagasi
  • The agreeable mistake largely burn because capital morally warm following a joyous population. warlike, insidious afghanistan

    hoon taehoon tae3 місяці tagasi
  • I totally thought this was live right now.

    ImJustSnipeHuntingImJustSnipeHunting3 місяці tagasi
  • Why do witches float?

    ImJustSnipeHuntingImJustSnipeHunting3 місяці tagasi
  • Make a boat

    ImJustSnipeHuntingImJustSnipeHunting3 місяці tagasi
  • 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:)

    IsuIsu3 місяці tagasi
  • if he was my teacher i would be willing to go to school

    IsuIsu3 місяці tagasi
  • my farts are under so much pressure that they're denser than air

    camo lioncamo lion3 місяці tagasi