Does a tea bag fly away when lit on fire? (2 Truths & Trash)
Vložit
- čas přidán 7. 05. 2024
- Thank you to Wondrium for sponsoring today's video! Signup for your FREE trial to Wondrium here: ow.ly/nseu50Mf3gn
Welcome back to 2 Truths & Trash, the series that tests your internet gullibility and shows you cool science experiments along the way. Let me know if you enjoyed the prediction round. I'll be experiment with more round types in the future.
Here's a list of questions answered in this video:
1. Does a helium balloon move toward the front of the car instead of the back of the car when you accelerate forward?
2. Can you make hydrophobic sand by painting the sand with oil-based paint?
3. Can you write a secret message with lemon juice that can be revealed with a flame?
4. Does a smaller balloon or larger balloon win a race across the room?
5. Which way does a spool rotate based on the direction you pull from?
6. Does hot water and cold water mix when the hot water is placed on top?
7. Does a Stirling engine work with ice too?
8. Does a tea bag fly away when lit on fire?
8. Can you quickly reload a Pez dispenser by placing the unwrapped candy in the bottom? - Věda a technologie
For those that haven't seen them, here's a link to a playlist from Season 1: czcams.com/play/PLOEAbE8LkxoBvlAjxk6PofT_qgjQdluVT.html
Also, an important piece to the explanation of Round 2 on this episode is that the smaller balloon actually produces more thrust than the larger balloon because the pressure inside the balloon is actually higher when it is smaller. Here's a cool graph I had found that shows this: tinyurl.com/yjcyhr4d
S/O Laser Diode for pointing this out. I made the appropriate edit to remove the less important factors that I mentioned in the video.
awesome videos always blows my mind even when im right would love to see lots more of this
You're wrong about the thrust being the primary reason as to the faster movement of the smaller balloon. If you look closely at the graph on the page you linked, you'll see that the Y axis doesn't start at zero. Normalize that axis, and you get a fairly negligible change in pressure over the time period of inflation/deflation of the balloon, meaning a relatively negligible change in thrust.
What's actually happening is that the larger balloon has more mass than the smaller one. In your experiment, looks to be about twice as massive. So it fundamentally comes down to Newton's second law, F=ma. A roughly equivalent thrust force acting on the blue balloon, which has twice the mass of the red balloon, will result in an acceleration of half the magnitude for the blue balloon as compared to the red balloon (and that ratio only grows as the red balloon gets even proportionally smaller than the blue balloon). The other factors (thrust changes due to balloon interior pressure, air resistance, friction on the string) have nowhere near the same impact as the relative mass between the two balloons.
The tea bag phenomenon was the inspiration for the invention of the hot air balloon.
If you believe in a god you are extremely gullible!
These are both entertaining and informative, literally one of the best series on youtube rn
Tru that
Fr
True
Best that you’ve found
Gotta watch more CZcams
Did you like the prediction round?
Yes 👍
Yeah
yes
I did however since I came here from the short I was confused as to how we were supposed to tell. Also since I commented on the short asking for an explanation on the balloons, and paused here to comment this, I hope there is some sort of better explanation that didn’t fit in the short. Also this is prolly my first or second long form video. I’m a slave to the algorithm so I only watch what is thrown at me sadly. Hopefully this and other comments on her have me in line for more of all of your stuff since it’s been a minute since I’ve even seen your shorts. I hate the YT cycle.
Lol my phone dies so I get some more suspense to see any explanation
A much bigger factor for the smaller balloon going faster was that it had greater thrust. When you are inflating a balloon you can feel that it takes way more force at the beginning when te balloon is small
Great point! I was even looking earlier this week at how the pressure is higher in a balloon when it's smaller (which is pretty cool to see the data on: tinyurl.com/yjcyhr4d). So I'm not sure how I didn't connect the dots or remember that important piece from when I was shown this demo back in high school. That's my bad. Thanks for catching that!
yeah, no. Just because it takes more force to inflate it (overcome the elasticity of the balloon) the pressure inside the balloon is very likely the same except the first time you inflate it, it takes more pressure but at a point you lose that pressure, which is basically the very moment it starts to enlarge. The reason why it shoots faster is because it has A: less mass to propel(air inside acting like a mass, small amount), B: less air resistance(smaller volume), C: same diameter of release valve.
@@Mario-iq4qz the balloon hadn't been plastically deformed by the inflation process, I know from experience that a large balloon produces less pressure once fully inflated because you exceed the elastic deformation limit, and it is permanently deformed (plastically) if you fully deflate a balloon you have filled to capacity it will *not* return to it's original shape. With the rubber permanently stretched, it cannot produce the same amount of pressure.
@@umbrakinesis2011 I agree about it plastically deforming, that deformation takes place at the smallest phase of the balloon probably less than 10% size increase. The balloon he showed was absolutely streched beyond that plastic deformation size after which pressure decreases rapidly to a stable pressure, at which minimal increase in pressure leads to more deformation decreasing the pressure back to to original(after initial spike of pressure) and adding more air leads to the balloon increasing in size and slowly in pressure until you reach pressure of initial plastic deformation and a little more at which point the balloon explodes. These two balloons are 100% at or very near same pressure, chances are, the bigger one is at a slightly higher pressure. The only difference would be if the balloon was never inflated beyond initial spike in pressure which would be visible on the balloon as it wouldn't be as seethrough(relatively speaking) or if the bigger balloon was inflated all the way near explosion point, also unlikely.
@@Mario-iq4qz I won't deny, you have a point. We didn't get to see what the balloon looked like before it was inflated or after it deflated to see how much plastic deformation occured, but I see what you mean, similar principles are used in rocketry; if you only need to go a set distance, a larger rocket will only slow you down because you have to accelerate all the fuel, and it has more drag. So that probably does have a greater impact.
You can easily load a Pez dispenser by opening the wrapper halfway, then aligning the open dispenser such that the plastic divides the wrapper from the pellets. Pressing results in the dispenser getting filled in one go while the wrapper is left out.
I WANTED THE PEZ ONE TO BE REAL SO BAD. Though I definitely think it’s cool that fire can make something float into the sky.
Second season was great! I really liked the switch up between how to guess for them. Also that rolling tube force vector blew my mind- I clearly didn’t pay enough attention in AP Physics.
Tbh I have a physics degree and didn't learn that because I didn't take dynamics so, you're good.
@@solsystem1342 Same here, I had to watch the full video after the short, completely confused me
I like these videos
I mega like these videos
I super mega like these videos
I ultra super mega like these videos
@@MariaGreenwoodArt We just naming IPhones now?
Me too dude
Im so glad that you‘re trying to move from short to longer videos. I wish more ppl would follow this movement
I love these videos because it tests my knowledge and gives me more! More learning than I get in school lol
these were the hardest ones yet, keep up the good work
Hey cool! I kinda forgot about these and I got a big smile on my face when I saw this. Can't wait for more, thanks Ja :D
This is honestly a genius format. Great hook and educational.
This video is the best 2 Truth & Trash episode I have ever seen. Keep the good work 👍
Keep up the good work, I really enjoyed these! Thanks
Excellent premier! Loved the prediction round.
I feel like the trick to fool us is to make a real one look as fake as possible.
Like, the flying tea bag looked so fake, I was almost certain you were blowing it up by a dryer or something.
The string wheel one was very informative. I don’t know where I’ll use such information, but I’m glad I know it and will know it for the next hour or so
I love these vids ! TY for making them ^^
I like that your explanations here are more detailed and slower-paced.
These are great, as well as a lot harder and more interesting!
5:30 I had to play that bit again because at first, I thought he said "JarJar Binks Science". 😂
Return of an absolutely goated series 🙏
Bro I love how these actually became more challenging. You should make an app game like this where it’s more interactive in a way? Idk just an idea. I play some riddle app but it literally has riddles that blatantly don’t make sense and it’s not even fun. These are actually fun lol.
Woooooo so excited for another season!!!!
Prediction Round Predictions:
*The Balloons*
_Theory 1:_
1) Neither ballon will be faster than the other (the balloons will travel at the same speed), but given enough length and time, the blue balloon would travel farther.
Assuming:
A) The balloons are equally elastic, (the container for the air stretches equally for both)
B) The size of the opening for the air to escape is the same for each balloon.
C) Atmospheric pressure is the same. (Pretty sure this would have something to do with it)
D) The type/mixture of gas in each balloon is the same.
A balloon filled with more air would not experience an increase in speed relative to a ballon filled with less air, because a balloon filled with more air would not experience an increase in pressure relative to a balloon filled with less air.
Any increase in pressure that might come from a having a greater volume of air is offset by the fact that the ballon increases in size to compensate, and similarly, any increase in pressure that might come from having a smaller container (ballon doesn't inflate as much) is offset by the fact that there is a smaller volume of air. So after everything balances out, the pressure, and therefore the speed should be the same.
_Theory 2:_
Wait a second though, all of this only really applies if the rate of deflation is constant at any potential size of the balloon (i.e. the proportion of air volume-to-balloon volume, a.k.a. the pressure, is linear at all stages of inflation) which actually might not be the case now that I think about it. It might be that the balloon does not inflate as much at bigger sizes because it has already been stretched thin in order to get that big, and so any increase in the volume of air is not offset by an increase in balloon volume as much as it might have been when it was less inflated. This actually would increase the pressure the bigger the balloon got, and cause the bigger balloon to go faster in the earlier stages of its deflation than the smaller balloon because of the increased pressure at the start.
As I'm writing this out, I think this might actually end up being the case. Unless the drop off in air volume-to-balloon volume ratio is negligible at higher balloon volumes, in which case we're back to theory one. (I don't think this is the case though, and if anything it would be greater at higher ballon volumes, due to the aforementioned stretching thin as it gets bigger.)
I don't know I'm confused now lol.
*The Rolling Glass*
2) The object will roll to the right, opposite the direction of pull, not to the left.
Since the string is being pulled underhand (from below the halfway point of the axle relative to the ground), the centripetal force (I think that's what it is) generated as the string pulls will cause the wheel to push off the ground in the same circular (clockwise) direction that the string is going, which, at the point the wheel makes contact with the ground, produces an opposing force from the ground that will push the wheel in the opposite direction of the pull. In this case that would be rightward, away from the leftward direction of the string being pulled.
If the string were being pulled overhand (from above the halfway point of the axle relative to the ground) then the reverse of everything I predicted would be true, and the wheel would turn counterclockwise, in the same direction as the pull of the string.
*The Colored Water*
3) The water will not mix with the hot on top an cold on bottom, but will mix with cold on top and hot on bottom.
Hot things generally tend to want to rise, because they are less dense and closer to a gaseous form than colder things, which are more dense closer to solid form and tend to want to sink. This the reason that steam and smoke rise to the top of a room, and the reason why on a cold day the air in a room tends to sit near the bottom.
In the scenario with the hot water on top and cold water at the bottom, the colors won't mix because the water at each temperature is already where it wants to be, and therefore won't interact much with the differerently-temperatured water, leaving the colors relatively in tact.
However, in the scenario with the cold water on top and hot water at the bottom, each wants to be where the other is, and so the cold water will attempt to sink to the bottom while the hot water will attempt to rise to the top, causing a lot of way more interaction between the two waters, and thoroughly mixing their colors in the process, resulting in what I believe will be purple colored warm water.
Fingers crossed!!! 🤞
The thread bottle rolling thing was hard to determine until you actually pulled and it rolled towards you. Then I got it. Sometimes, the smallest demonstrations are all it takes. That's true for a lot of things (like standing up against a force trying to control all of you).
Balloon is a nice demo of the equivalence principle.
Epic video, these are so cool.
3:36 The blue balloon does indeed experience more air resistance (F), but this is due to a larger frontal area(A).The drag coëfficiënt (Cd) is indepentent of frontal area in the following formula F=(1/2)*rho*(v^2)*A*Cd.
Two objects with the same shape will have the same drag coëfficiënt, even if one is larger. (That's why Tesla semi truck can have a lower Cd than a Bugatti, because a Bugatti has a very low frontal area A)
You got into a daily dose of the internet video!!!
Glad to see you get a sponsor, fantastic videos
Bro, you stepped your game UP!
I like this style, and the prediction rounds
I answered wrong on round 1, right on round 2, and had to guess but answered correctly on round 3. Love the new style of videos.
I pretty quickly recognized that the Pez video was the fake one, but I still LOVE that editing trickery
Love this series
These videos are entertaining for some reason
Dang. Responded to one of your comments earlier explaining my excitement but I feel like I’d like more of an explanations as to why some of the wrong ones don’t work. :) still love it thi
Really amazed and entertained and blown away with the facts
The prediction round was great fun
The lemon on paper thing was literally an entire plot point in the first National Treasure movie
Round 1: A. Helium balloons are less massive than air balloons, and thus wouldn't be thrown backwards as far. But they would still be thrown backwards due to inertia. The hydrophobic sand makes some sense, because oil is hydrophobic, and I'm well aware of how lemon-based invisible ink works. (Well, you got me good. Your explanations all made sense, they just didn't occur to me).
Round 2: Tough choice, but I say B. A makes total sense to me, because at some point in the left balloon's motion, it's going to be in the same state as the right balloon, but will have already moved some by then, so it will naturally go farther. C was a little weird to wrap my head around, I would expect the cold-on-top one to do a full inversion, but I think B makes less sense. The force you apply by pulling will be countered by the force against the floor due to the unwinding torque. (Thanks for making me question whether I deserve my recently acquired BS in Engineering again lol)
Round 3: I'm gonna say E because both B and C seem sus to me. I'm not sure, but I don't think the source of an updraft can be lifted by said updraft. I also don't think that the Pez dispenser would be able to just shoot the wrapper off like that, since I don't think that the momentum of the wrapper will be enough to rip the top open without completely arresting the motion. (Huh, didn't know updrafts worked like that).
If you want to make hydrophobic sand at home use Scotchgard. Lay the sand out in a thin layer and spray with Scotchgard. Let it dry and mix it up. Repeat a couple of times and you should be all set.
Damn. 1 out of 3. The only one I got was that balloon one.
In hindsight, the painted sand was so obviously switched out for hydrophobic sand, I don't know how I fell for it. But I did.
And I had a much easier time imagining that the pez candy company designed their candy in such a way that you could rip the wrapper off all at once like that, than a flaming teabag flying under it's own power.
I cut the pez wrapper down one side and put it all in in one shot.
Then, you can hold down the pez candy while pulling on the cut wrapper to unwrap it in the dispenser.
1:51 Mark rober visuals be like
In round 2, I'm litteraly having that stuff in school rn 😂 (balloon and the wheel with a rope)
The pez one was so obvious to me because I basically have the dispenser memorized.
Not me with two science degrees still feeling proud of getting these right 😂
What a cool and creative idea. I hope you don’t run out of ideas.
My reason for the smaller balloon being faster is because in my head, they are both exherting the same amoutn of force.
but while the bigger balloon is experiencing more drag, they also have more mass, while air is escaping (proportionally) at a similar rate to the smaller balloon, the energy generated between the two is roughly the same
So if you were hit by both balloons, it'd feel the same. but as the smaller balloon has less drag + less mass contained in itself, it doesn't need to push nearly as hard to go as fast.
odds are this is probably incorrect, but this is my hypothesis based on what I know about mass and acceleration
I think you're right about the drag causing an opposite force on the balloons, but the larger balloon actually has lower pressure air inside it as well.
I only got the first one wrong, but man you didn't make it easy especially with the prediction round and the answers D and E
4:38 Okay so if you open up the PEZ package but keep all of them in a stack in the package, you put it in there, THEN you pull it away, it works
It's usually pretty fiddly but easier
I like the prediction style.
I remember watching one of those pez videos where the wrapper that "supposedly" came out and the wording was reversed from the way they put it in.
I really liked round 2
Thanks for the feedback! I'm glad
I knew the balloon one was off, but for the wrong reason. My idea was that it wouldn't beat it because of how having a bigger fuel tank doesn't necessarily make you faster. But I neglected the fact that the bigger tank = bigger vehicle, and that bigger vehicle = worse gas milage. I thought the blue balloon would only win because it would have more "fuel" to work with and would take longer to burn out.
Oh yeah dude, the second predictive round would literally be a cool game for an app or something.
Maybe make it where if you choose an answer, an animation will play and basically answer if it was right or wrong. If right, it’ll do the animation and have a positive indication. But if you choose wrong, the animation will play but in a way that shows you’re wrong.
Idk if that made any sense tbh lol
Can we just take a moment to appreciate this man’s hackysac skills
I’m not fully convinced at the balloon one. I know many rubbers don’t follow Hooke’s law but there is this thing called hysteresis, where the state of the elasticity curve depends on the history. One good example is the magnetization of ferromagnetic materials. In this scenario, whether the balloon is inflated or deflated to the state matters. I assume in the experiment both balloons are inflated to the state. I doubt if it’s still the same when they both deflate, or one inflates while the other deflates to the state still hold the same result.
Round 1: a) true (seen other videos about it), b) false, c) true (learned that as a kid)
Round 2:
a) false, red balloon will win (same reason air goes from a less-inflated balloon to a more-inflated one when they're connected with a tube, I think)
b) true, the bottle thing rolls to the left, I don't know exactly why ... *(after the explanation, I do remember learning that in physics)*
c) true, hot water is less dense than cold so it floats on top
Round 3: a) true possibly, just requires a temperature difference, but it would rotate in reverse? b) true, c) false, doesn't make sense that the paper would shoot out the bottom, I'd expect it to get crumpled at the top
Edit: nice 👍
#1 was fun to think about. Instinctively, I said 'True'. Then I thought: wait, helium is just lighter, it is still the mass that is thrown backwards. So false. But wait, helium isn't just lighter. It is lighter-than-air, and the air gets thrown back, so it gets launched forward. So true!
The odd noises really helped with the assuming it was false, as it created doubt; what are the noises hiding or distracting from?
2:05 BRO IVE DONE THIS EXPERIMENT AT SCHOOL BEFORE BUT I FORGOT WHAT HAPPENS
And here I thought you just made shorts! Glad you have longer ones with explanations! Still, you go a bit...fast for me.
Get this man 1 mill
4:21 y'aint slick, bub
out of curiosity, where do you learn all this? Any recommendations?
Got 2/3 correct😢 Great vid!
Got 1/3 Correct, these got way harder than Season 1!
Got the First Round Correctly, But voted for B on the second one, and A for the first one.
R1: My guess would be B is false. No reasoning other than I think A and C are correct.
Edit: Oh there were more.
R2: In A, the balloon with more air also is heavier, but the gummy part weights just as much. But would still say A.
R3: I already knew of all three before. Nice vid! :)
I can't waittt!
1 : B
2 : A or C, really thought that the hot and cold water would mix but only more slowly.
3 : C
In fact, if you pull the pest container to the max length, it can get and then you insert Unopened pez Thing Into the bottom then Use your thumb to block the hole that you put the testing in. And then push the container shut. Then when you open it up, the wrapper. Get the pull the wrapper out. And then now you have a full pez container.
round 1: my guess is definitely either B or D. oil is hydrophobic, but I doubt it would be _that_ hydrophobic, and oil cant dry so I don't know wat he meant by "let it dry." and I just realized, the sand after the cut is different in size and color and is uniform in consistency, definitely fake now that I think of it. so I guess B
round 2: its either A or C but depending on the error involved and which balloons were used, and whether or not they were stretched to full size beforehand, this could totally be true or false, the small balloon may be less stretched, and therefore tighter and will actually move faster, Idk. similar case for the water, I've seen a similar demonstration done with ice water and room temp water and I know the warm water wants to float, but I'm afraid diffusion will cause them to mix anyways. I guess A
round 3: C, no more must be said.
3/3 again, I'm subbed and your most loyal watcher, maybe, idk 🤷♂
The string one… dang. My brain still can’t get that
Thank you! (And now I am feeling like I'm smart)
not me testing the one about pez with the pez dispenser on my desk
This episode was nice and easy, hope it doesn’t get harder😅
Also a small balloon outputs a higher pressure, like when you link two balloons together, the less inflated one will inflate the other...
3/3 LETS GOO
number 2 in the prediction round, it isnt a cross section.
i have the same exact chair that is in the big balloon vs small in round 2.
I knew it was fake but man how cool would it be if u could load a pez dispenser like that and literally nobody ever knew lol
I disagree with the pez dispenser but. I swear I put a “refill” into a dispenser before
3:54 I know that was real because ive used paper and and paper towels as fire starter before
We did the teabag thing in kindergarten, but we lit it from the bottom, that way the whole thing rises from the beginning on.
If this guy taught us all maths/engineering we would all be geniuses.
the cut in the last one was very noticeable, so i knew it was wrong
Anyone looking for the answer it's...
Have you actually watched the video?
Or are you just looking for the answer?
Ok, you've earned it, the answer was B.
The coloured sand just acts as normal sand when met with the liquid.
He switched out the sand with a store - bought hydrophobic sand.
1/3, with Round 1 being correct.
I got it wrong but for the wrong reason
Really says something
2 out of 3 rounds got the last one wrong lol
Shouldn't have doubted myself thinking I used Pez dispensers in a wrong way as a kid. I guess they are just terrible by design.
Part 3, A is wrong since there's no cold energy, only heat energy. Ik B is right since i've burned paper before. C is prob right since isn't that what those things are for?
i'm wrong again lol, i honestly had no idea how you faked the thing in C, it looked so real
I wished it was real, I was so ready to try it out.
I got all 3 right for once :D
This is genius
I was hoping that there would be one where two were wrong
I imagined E for the first one: all were wrong
For the second one, I expected the blue balloon to move slower
For the last one, the editing on C might be adding a bias to make people guess it's false... oh it's correct
Even though I knew the Pez one was fake, I really wanted it to be real too.
I got 1/3, I could see the cut during the pez one.
Let’s go I got them all right