We love science for kids!

2013年5月26日日曜日

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.

2013年5月9日木曜日

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.

2013年5月7日火曜日

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.

2013年4月17日水曜日

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.