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

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Aug 16, 2016


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


  • 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
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Kevin (aka The Backyard Scientist) and I filled a pool with 25 million waterballs (aka Orbeez) so I could settle an argument about how far you sink if you jump in.

Go watch Kevin's video- /watch?v=BDS4DHxPQRE

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