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5 Easy At Home Science Experiments w/ Mark Rober
آمار یادگیری
سطح CEFR
سختی
زیرنویسها (255 بخشها)
Today we're gonna do five at home experiments that are very near and dear to my heart.
And for the first time ever, we're sharing the recipe for our favorite bit of chemistry called
Elephants toothpaste.
We've got some epic science lined up, and the coolest thing is that all of them can be easily
done at home yourself.
- Whoah, whoah, Bob, whoah!
- First up is my childhood favorite, the egg in a bottle experiment.
- All right, “Science Bob” Pflugfelder, I did this at the science fair when I was in first grade.
If the main reason I liked it is because it involved fire and I was allowed to light things on fire.
- I'm impressed.
- The ingredients for this experiment are very simple.
We have an egg that's peeled, hard boiled, just like a standard milk bottle you could order off
the internet.
- The neck size is very important though.
- You want it to be just smaller than an egg.
How do you get the egg into this jar?
Because as you can see, it can't really work.
It breaks the egg.
That could have been a mistake!
There we go.
How do you get an egg into this jar without breaking the egg and making a mess like this?
- What's the secret?
- The secret, Bob... is fire.
First off, goggle up for safety.
We're gonna grab these papers with tongs.
We're gonna light the paper, put it in the jar, put the egg on top.
Look at that, a fully intact, non-broken egg is now inside this jar.
When air heats up, the molecules want stretch out, they're moving around a lot.
So when we light that fire, the air inside, oh, it wants to stretch out, but as the flame goes out,
that air starts to cool down.
Then all the air molecules kind of suck back together and it just pulls the egg right back into
the jar.
So now the question is, Bob, how do we get this out?
- So you have to go from a vacuum to pressure.
- We just blown into this jar, huh?
And there's our egg.
- We should add a variable.
A variable is something that you change.
We have a water balloon that's significantly bigger than the opening.
- Again, if you're using fire, adult supervision is definitely required.
OK, that should get nice and hot.
Now your challenge is to get that out, Bob.
- That's all we get.
I say we go one bigger.
There we go, there it is.
It's cooling.
- Wow, man, we're getting so close.
- And we can't push it in either.
- No.
- We could try, wait.
- Well, can we?
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