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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