DENJIRO: Today, I'll show you a scientific magic trick using sand. We have some sand in this container, and on top, there is an egg. I'm going to cover the container with cloth and send my special powers to it. Happy Energy! When we remove the cloth... a duck is born! Isn't this strange?
I'll explain what happened here using a ping pong ball and a metal ball. We bury the ping pong ball in the sand, and place the metal ball on top. The container is connected to a tube, which is then connected to a blower. Let's turn it on.
When the blower is turned off and there's no air coming, the sand is hard when you push it down. However, when we turn the blower on, the sand moves freely like this. Therefore, the metal ball, which has a higher density than sand, sunk, while the ping pong ball with a lower density floated to the surface. When I stop sending air, the sand returns to normal.
This is the flowability of powder. The magic trick we performed earlier used this principle to switch the egg with the rubber duck. Let's see how air makes sand become flowable. It is evident that the air from below moves up like bubbles. As air pockets form, the sand surrounding it flows down.
Now, we'll put a propeller-fueled mini boat on the sand. It cannot move on its own. Let's try blowing air into the sand.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"
Негізгі бет The Magic of Sand / Mr. Denjiro's Happy Energy!
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