Name: 2500萬Orbeez在游泳池裡，你是沉還是浮？ (25 MILLION Orbeez in a pool- Do you sink or float?)
Uploaded: 2021-01-14T08:45:40.000Z
Duration: 7 min 1 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

A while back I was eating lunch with some co-workers and we were debating

第二類條件句型

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

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

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 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

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

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

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

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

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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

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2500萬Orbeez在游泳池裡，你是沉還是浮？ (25 MILLION Orbeez in a pool- Do you sink or float?)

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