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DENJIRO: Today, I have a toy that was popular in the past. This is it right here. It’s shaped like a boat. When I float this on water...
BOY: It’s moving!
DENJIRO: As you can see, it is moving across the water. This is an old toy known as a “camphor boat.” There is camphor attached to the back of the boat. Camphor can be made from camphor trees, and it has a distinct smell. It is used to make insect repellent. This camphor is actually what drives the boat. So why does the boat move because of camphor?
Camphor can reduce surface tension of water. The surface of water is being pulled in different directions due to surface tension. When you attach camphor at the back of the boat and float it on water, the dissolved camphor reduces surface tension. Therefore, the pulling force behind the boat is weakened. As a result, the boat is pulled forward and moves.
Let’s perform an experiment that will easily demonstrate why a camphor boat moves. Let me drop some ink on water. I will now slowly place a burning piece of camphor.
BOY: The camphor is moving while pushing the ink aside!
DENJIRO: It’s moving faster than before because by burning the camphor, more of it is melting. Now, let’s place lots of burning pieces of camphor on water and make the room dark.
BOY: It’s beautiful!
DENJIRO: You can create a mystical phenomenon that looks like balls of fire floating every which way.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"