Hi I am Jared welcome to Fun Science Demos.
In another video we showed you that air takes up space and it has weight.
And scientists call the weight of air air pressure.
Now air is pushing down on us all the time.
We cannot feel it because we are used to it and we cannot see it because it is air.
But that air the pressure of that air can do some pretty powerful things.
And we want to show you a demonstration
that plays with the pressure of air.
Now in another video we showed you the egg in the bottle demonstration.
We lowered the pressure inside the bottle and that made the pressure
outside strong enough to push the egg into the bottle.
What happens if you do not have the perfect size bottle.
What happens if you have a smaller size bottle
and there is no way the egg will fit in Well we have the answer for that today.
Now to play with the power of air pressure you are going to need some things.
You are going to need a glass bottle.
You are gonna need some matches some paper a straw and a balloon filled with water.
I like to keep that balloon in a cup of water to
make sure the water helps the balloon make a nice tight seal on the bottle.
So how do we start Let us start by taking a look at the air pressure.
When I put my water balloon on top of the bottle
the air pressure inside the bottle is the same as the air pressure all around the balloon.
And you will notice if I try and push the balloon in.
It is not going in
because that air is taking up space and the pressure is
keeping me from pushing the balloon in the bottle.
So how do we get this balloon into the bottle.
Well we have to lower the pressure
inside the bottle so that the pressure outside can push it in.
How do we lower the pressure.
We are going to use science.
First thing we need is safety. A big part of science is safety.
So what we want to do is light a piece a paper on fire and drop that paper into the bottle.
Two things are happening.
As that paper burns it heats the air and the air leaves the bottle.
You will actually see the balloon bounce as the air
is rushing past the balloon.
The second thing is that fire is using oxygen in the air in the bottle to burn
That paper burning up the oxygen also lowers the pressure inside the bottle as well.
So now we are going to zoom in and see this demonstration in action
So I am going to start by taking a piece a paper and folding it back and fourth.
Take my time make sure its nice and neat.
Why I fold the paper is so that it can fit inside the bottle.
Now scrunch the top it is going to work.
Next I need to take my finger and wet it so that I can wet the inside of the bottle.
Dry my finger off and I am ready for this to work.
Let us light our match let us light our paper.
Drop it in balloon on top
and it worked.
But I have a problem
How do I get this balloon out Well sometimes if I am lucky
I can just pull the balloon out.
But what happens if I use a bigger balloon and I know it is not going to pull out
Well let us take a look at that one right now.
Alright we are ready to light and watch our demonstration work
Let the paper catch
drop it in
The bigger balloon worked.
So how do we get this bigger balloon out
We cannot pull this bigger one out It is on there.
So we are going to use science to get it out
Think about this We have to now increase the pressure inside the bottle
to let the air pressure help us pull it out If we can make the pressure greater
inside the bottle that balloon is coming out.
How do we add air pressure inside the bottle?
That is where my straw comes in
I am going to stick the straw down alongside the bottle in the balloon
and what this allows me to do is to blow into the bottle.
I am going to increase the air pressure and the balloon should pop out.
Will it work Let us see Here we go
Air pressure is an amazing thing!
Scientists like to measure air pressure because air pressure has the power to change our weather
If it is high pressure if there is a system of high pressure
that means the weather is going to be pretty nice
If there is a system of a low pressure coming in
that means storms are coming.
Scientists call the tool or instrument used to measure air pressure a barometer
The old type of barometer is actually called a storm glass.
Sailors would hang these on the masts of ships to see when storms were coming in.
It would actually measure air pressure
There is also the liquid barometer which uses a liquid to measure air pressure
and an aneroid barometer which does not use a liquid.
All of them measure the power of air pressure
If you want to learn more about weather or air pressure check out our link in the video description.
Science is so cool!
Air pressure is so powerful.
Thanks for watching.