Inflate a balloon in a bottle!

Inflate a balloon in a bottle!

At first, a glass bottle and a balloon are required.

Hot water or hot tea is poured into a bottle as shown in a photo.

Just after the pouring, you should cover the entrance of the bottle with the balloon, immediately.

Wait for a hour or so.

Air in the bottle is cooled and you'll find that the bottle is negative  pressure.

Look at the bottle as shown in here.

The balloon was inflated in the bottle!

Hot water or tea may be dangerous for children.

Please take care if you try the exam with your kids.

Let's make a bone conduction headphone!

Let's make a speaker to understand why we can listen to music.

First, you should make a coil. 

The coil is made of copper because you have to flow current to it.

Next, the coil is connected to a component stereo as shown here.

Third, put the coil on the magnet, and adjust the volume.

You can observe that the coil is dancing.

Put the coil and magnet on a can or plastic trash box,  and etc.

You can listen to the music!

This is a hand-made speaker.

Lastly, let's try to listen through bone conduction.

If air vibrates, this is a speaker.

On the other hand, if bone vibrates, this is a bone conduction headphone.

Hope you and your kids enjoy the exam.

Let's ice with salt

Let's ice with salt!

It's easy to play.

First, you should have a thermometer and a lot of ice.

Measure the temperature when the cooling starts. 

After about ten minutes later, the temperature may be stable.

Let's pour three spoons of salt in the ice!

You can observe that the temperature cools more.

 Look at the thermometer!
The temperature falls to -19 degree.

Let's observe the following graph.

You and your kids can understand that Salt is fantastic catalyst.

Hope you and your kids enjoy the exam.

Let’s dissolve egg white using shampoo!

Shampoo has ability to denature protein.

Let's put the shampoo into white egg and observe the denaturation of protein.

First, put the white egg into the glass.


Next, put the shampoo into the glass of white egg.


After a few minutes, you can observe the denaturation of protein.


In the exam, you and your kids find that the excess shampoo may hurt your hair.

Hope you and your kids enjoy the exam.

Difference between a raw and boiled egg

Do you or your kids know how to distinguish between a raw and boiled egg?

It's easy to distinguish.

A raw egg does not coagulate.
Therefore, it's hard to start spinning and stop.
Look at the movie as follow.
You can see the slow rotation and when I stop the rotation, the egg does not stop immediately.

On the other hand, a boiled egg coagulates.
Let's spin the egg to learn.
You can see the faster rotation and when I stop the rotation, the egg stop immediately.

Hope you and your kids enjoy the exam.

Float the ping-pong ball in the air!

Float the ping-pong ball in the air!

It’s easy to setup and you can have fun with your kids.

Setup a blower as shown in a movie and turn on the switch.

Please note that hot air may be dangerous to the ping-pong ball because the air generates by a blower.

Put a ping-pong ball on the generated air gently!

Observe the ping-pong ball is dancing.

Did you know that the ping-pong ball can float in the air?

Hope you and your kids enjoy the exam.

Make a coin run in the balloon!

Let's make a coin run in the balloon.

Firstly, you need a balloon and a coin.
The light coin is desired as shown here.

Next, the coin is put into the balloon.

Inflate the balloon and fasten an entrance of it.

Lastly, make the coin run in the balloon as shown in the video.

This fantastic moving is caused by Gyro effect.

Did you know why the coin runs stably?

Hope you and your kids enjoy the exam.

Let’s make a telescope with your kids!

A telescope is expensive tool to observe moon, the stars, and etc.

However we can easily make the telescope. 

At first, we should prepare two magnifying glasses (A, B). 
Glass (A) can attach to the distal position. 
Larger lens (A) is desirable. 


Glass (B) can attach to the proximal position. 
On the other hand, smaller lens (B) is desirable. 


Attach these lenses to rectangle or circled pasteboards as shown in the photo. 



Assemble a telescope as shown here. 

Be in a focus adjusting the difference between two lenses. 
Although you can see it is upside down through the hand-made telescope, I think you are surprised at the ability of it. 

What did you see through these lenses?

Hope you and your kids enjoy the exam.

Let’s make a couple of coins shine!

Japanese 10-yen makes of copper. 

Old 10-yen coins are often oxidized, and the color is dark blown. 
In this photo, left is new coin in 2012, middle one is in 1974, and right one is in 1966. 

Let’s make these coins shine. 

We prepared two liquids. 

One is squeezed juice of a lemon. 

Other one is vinegar. 

After these coins are sunk in two liquids, wait 3 minutes. 

You can observe the clean coin which was sunk in the lemon juice. However, the coin in vinegar is unchanged. 

8 hours later 

You can observe the efficacy of vinegar.

24 hours later

Right black blown is a non-sunk coin.

The effect of deoxidization is fantastic.

Hope you and your kids enjoy the exam.

Let’s dissolve an eggshell

Let’s dissolve an eggshell in vinegar water.

It takes a couple of days until the unshelled egg.
Can you see the air bubble around the egg?

1 day later, the eggshell is dissolved a little.

5 day later, the eggshell is dissolved completely.

Awesome result! The eggshell was dissolved completely.We can observe the beautiful transparent semipermeable membrane.

Look the photo which compared with a raw egg.The transparent egg was bigger.
When we observe it through the light, the beauty was the best!

Hope you and your kids enjoy the exam!

Let’s attach the inflated balloons on the ceiling

In winter, you can enjoy the electrostatic study with your children. 

Firstly, two balloons were inflated without helium gas. 

Secondly, the balloons rubbed on the carpet to generate static electricity. 

Thirdly, the balloons were attached on the ceiling. 

 Look! Our exam was succeeded easily, and we had fun. 

 After the exam, a humidifier was turned on. 

 A short time later, two balloons came down. 

 Hope you and your kids enjoy the exam. 

Non-leakage nylon bag?

Impale water filled nylon bag on a sharp pencil! 

However, do not leak the water. 

Can you succeed the exam? 

To tell the truth, it’s easy exam. 

Impale water filled nylon bag on a sharp pencil. 

The pencil can easily pierce the nylon bag, however, the water does not leak at all. 

Why? It’s marvelous. If you pull the pencil out, the water leaks with great force. 

Hope you and your kids enjoy the exam.

Let’s observe an infrared light in your living room

We human can’t observe the infrared light through our eyes.
However, it’s easy to solve this problem.

Let’s use digital camera and a remote controller for TV, DVD player or air conditioner.
The remote controller irradiates the infrared light to send the signals.
At first, when the switch is off, the infrared light is NOT observed.

Secondly, when the switch is ON, your eyes do NOT catch the light.

Thirdly, when the switch is ON, digital camera can detect the light, and you can observe it.

It's very interesting.
There is the invisible light in our world.

Hope you and your kids enjoy the exam

Let’s make a circle rainbow in your living room with kids

It’s easy to setup without dangerous, and you can have fun the colorful lights. 
 
Firstly, you need a flashlight and a CD. 
Secondly, flash the bottom of CD and observe the circle rainbow obtained. 

Hope you and your kids enjoy the exam.

Let’s play two polarizing plates with your kids

Pile up two polarizing plates on the table. 
Rotate upper plate 45 degrees or 90 degrees, and observe the strength of light. 

Next, pile up a polarizing plate on the monitor. 
The monitor of PC and cellular phone is suitable to observe the phenomena. 
If the strength of light is changed according to the angle of plate, the similar 
polarizing plate is embedded in the monitor. 

Lastly, sellotape on the acrylic plate as you like. 
Multi-angle, multiple sellotapes are preferred to this exam. 
Sandwich the acrylic plate between two polarizing plates. 

Let’s observe the created fantastic lights. 

Hope you and your kids enjoy the exam.