Hi, I am Jared. welcome to Fun Science Demos.
We have something for you to think about to start things off.
I am going to take a glass bottle, a small piece of paper that is just balled up.
I am going to put the piece of paper right into the front of the bottle,
and I am going to try and blow that paper into the bottle.
It does not seem too difficult.
What do you think is going to happen? Let us see.
Wait a second.
So what happened?
Why did the paper not go into the bottle? Why would it come out of the bottle?
Well maybe I did not blow hard enough.
Let us try again, and I am going to blow a little harder.
Let us see what happens.
So what is happening?
Well, science is happening.
There must be something inside the bottle that is pushing the paper out.
But I do not see anything, do you?
Well, that is the big idea today.
That something inside the bottle that pushes back is air.
And air pushes things all over the place.
Something as simple as that piece of paper, or something a little bit bigger like an egg.
Now before we look at the egg, let us take a closer look at the air.
Through science we have discovered that air is matter, and matter takes up space.
How can I see that, if I cannot see air? Well look at this bottle.
A plastic bottle with a cap on, but what is inside the bottle?
Air.
If air is inside ,and it takes up space then it is going to keep me from crushing the bottle.
So here we go.
I am pushing hard with my fingers, but I cannot make them touch.
Why? well the air inside is taking up space.
What happens if I take the cap off of the bottle?
Why can I put my fingers together?
Because the air rushed out the front of the bottle.
I just could not see it.
Air pushes against things.
So let us get back to the eggs.
I have two empty glass bottles with an egg on top.
And these eggs are going to show us the powerful ways that air can push.
Now through science we have discovered that there is
miles of air above us, and that air is pushing down in all directions.
So why is the egg not - if air is pushing on this egg - why is it not going into the bottle?
Well, that is because there is air inside the bottle pushing back.
So what would happen if I can take away the air inside the bottle?
That is an interesting question.
We can see what happens using science.
So how do we get the air out of the bottle?
That is where science comes in.
We are going to use this piece of paper. we are going to light this piece of paper on fire, we are going
to drop the piece of paper in the bottle, and put the egg on top.
As that paper burns it heats the air.
And then we are going to zoom in so you can take a closer look at the egg.
You will see the air rushing past the egg. The egg will actually vibrate.
It is vibrating because the hot air is rushing past the egg.
All the air -most of the air -is leaving the bottle.
That means all the air up top above it in this room,
miles up above it, should push the egg into the bottle.
Let us take a closer look and see if that is what happens.
Let us watch this happen.
Let us take the egg down, light the match,
light the paper, let it burn a little bit, drop the egg on.
It is bouncing - pressure of the air pushes the egg into the bottle.
Let us take a closer look at what happened.
My egg got totally ripped apart.
That air pressure pushing down against this bottle ripped the egg apart.
I can probably dump these pieces out and clean it up.
But what would happen if that egg did not get ripped apart?
When the air pushed the egg in, what if the egg remained whole?
How do I get the egg out of the bottle?
We are going to try and demonstrate that.
Let us try it again with a smaller bottle, and see what happens.
But remember, if you are going to try this at home you need a
good pair safety glasses or sunglasses to make sure you are safe.
So here we go.
Let us try it with the smaller glass bottle. It is important to use glass because plastic could melt.
So light the match, get my paper burning drop it in.
The egg went right into the bottle.
And it is in there, the whole thing. So how do I get it out? Well, I use
science.
So how do I get the egg out?
Well, when I turn the bottle upside down, you can see the egg gets trapped.
There is some air inside, so I need to actually put
more air into that bottle, so that air can push the egg out.
How do I get more air
into the bottle? I am going to use my mouth to try and blow air into the
bottle. I should be able to blow strong enough that the air rushes past the egg
and then pushes the egg out.
Let us see if I can blow hard enough to force enough air
behind the eggs so that air can push the egg out - hopefully all the way out - of the bottle.
It may not get there. let us see how hard I can blow this thing.
Oh, it is almost there almost there.
And I can just- listen to the sound- I can get it out.
It is amazing to think that air is strong enough to push that egg into the bottle.
But remember, air is not just pushing down, it is pushing from all directions.
So we can take a closer look at that.
And to do that, we are going to put the
bottle upside down, and we are going to see if the air can push the egg up into the bottle.
How do we do that?
Well, we need to put a candle or two into the egg.
Let us light that up and see what happens.
Get my candles lit,
turn it upside down.
Now that air is being heated.
What happened?
The air actually pushed the egg into the bottle.
Even though it was upside down.
Air is pushing from all directions: down, up, sideways.
Air has the power to push things all around.
So what is so important about air pressure?
Through science, we have discovered that air pressure has a lot to do with our weather.
When there is high air pressure, the weather is nice. it is good.
When there is low air pressure the weather is stormy.
Not so good.
Science is so cool.
If you want to learn more about air pressure and weather, check out our links and other videos.
Thanks for watching.