25 MILLION Orbeez in a pool- Do you sink or float?

A while back I was eating lunch with some co-workers and we were debating about just how far you would sink if you jumped into a pool of these orbeez For example would it go up to your calf or to like your waist or all the way above your head Everyone seemed to have a different theory, in fact I asked about a hundred people and you can see how much the guess is varied, so as a firm believer in the scientific method I decided to test our hypotheses So I'm here today in the backyard of the backyard scientist. so for the past six months we've been stockpiling these orbeez in Kevin's backyard and today it's finally the moment of truth all right you ready for this let's do it so take a moment to guess in the comments below of how far you think we'll sink and then we'll see if you're right For the record I think I will sink to about the waist, okay here we go This Feels so crazy This feels like its compressed on all sides but it's so smooth and like slippery So it looks like I was wrong by quite a bit and we have to reject the null hypothesis So now what I decided to call up my nephews you guys want to come swimming at my friend's house in my ongoing quest to be the favorite uncle only I might have forgotten to tell them there'd be no water in the pool also that kevin was right there You guys ready to go swimming in this But before we go swimming in 25 million orbeez let's talk about why I was wrong It has to do with buoyancy so here's a riddle when this ice melts will the water level go up or down as you can see here it actually doesn't change at all Archimedes taught us that you displace your weight in water so this baseball weighs about 135 grams and when I put it in water it will sink until it is pushed out 135 grams worth of water at which point it's in equilibrium and it floats and since the waterline is about halfway up the baseball you know it's about half as dense as water and this is why scooby-doo quicksand is pure lies you sink until you've displaced your weight in quicksand and since it's about twice as dense as a person you Bob like a cork about halfway down and it's impossible to sink so Atreyu relax your horse is going to float So I will keep sinking in Orbeez until I have displaced my weight in Orbeez and since they're a little more dense than me and taking account the packing efficiency of a sphere surrounded by water the fact that about 85 percent of me sank makes sense I thought the friction between the balls would play a bigger role which is why I guessed halfway so I was wrong but a lot of times that's more fun because that means the result was unexpected and you learn something okay back to the pool Guess where my foot is So a huge thanks to Kevin for letting us use his pool he actually also made a video we did eight crazy experiments with a pool full of water balls so go check that out because his footage is amazing as always I also want to thank Squarespace for helping to make this video possible you guys know I've been using them to build websites long before they offered to sponsor my videos it's really easy there's no coding required and you get a highly customized website that's super professional my infrared microwave website took me about an hour to put together so if you have an idea you want to launch or maybe you just want to showcase your business or perhaps a hobby go to Squarespace.com/markrober for a free trial and then when you're ready use offer code MARKROBER for 10% off so everybody wins because not only will you have a super customizable website that looks amazing but you'll be supporting future videos that I have in the works thanks for watching If you really liked that or if you really didn't like it or if you're like mehh then you should definitely subscribe I can wait

Channel: Mark Rober

Views: 34,437,249

Rating: 4.8924437 out of 5

Keywords: Orbeez, waterballs, water balls, swimming pool, vat19, mark rober, nasa, worlds largest nerf gun, watermelon, backyard scientist, slo mo, high speed, squarespace, pool jump, extreme, gopro, fun, quicksand

Id: MFVXsnq230c

Length: 7min 0sec (420 seconds)

Published: Tue Aug 16 2016

Reddit Comments

[u/hales2142]

how did they clean that up after? thats the video i wanna see

[u/iamboredalready]

So according to this site if I'm reading it correctly.

10,000 per set

Only $1.89 per set after 479 sets

25,000,000 needed / 10,000 per set = 2,500 sets

2,500 sets x $1.89 = $4,725

Doesn't seem as expensive as I thought.

[u/PSGWSP]

Was anyone else worried that one of the kids was gonna go in and just get stuck down there? Yes, I'm a dad.

[u/chigger2508]

Oh man I wish they had used clear ones. Imagine a pool full of these. I wonder how deep you'd still be able to see....

[u/Girm1987]

I have no idea what orbeez are. Can some one explain please

[u/smellslikecocaine]

This looks like so much fun.

[u/ikahjalmr]

Cool but the song was grating

[u/SuedeSalmon]

I like how much the smallest kid could stay on top of the surface, even flipping in, bit like a wetter foam pit

[u/lift_drugs]

"It feels like compressed on all sides...but it's so smooth and like...slippery."

Nice.