DENJIRO: I have here a metal rod. Did you know that you can start a fire with this? It’s very easy. I’m just going to keep striking this rod with a hammer.
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BOY: It’s turning red!
DENJIRO: It’s a success. As you can see, we have started a fire. The metal gets deformed when you keep striking it, and it reaches a temperature of over 600 degrees Celsius. That’s why were able to start a fire. I used soft metal as it’s easy to deform. The key is to turn the rod as you strike it. If you keep striking the same side, the rod would simply get flat. But by turning the rod to keep it a certain thickness, you can raise the temperature.
So why does striking the rod make it hot? Let’s perform an experiment using water. The lid of the bottle has a temperature sensor. If I put the lid on, the temperature of the water is displayed on this screen. 23.78 degrees, so roughly 23.8 degrees. Now, I’m going to vigorously shake this bottle.
GIRL: The temperature is rising!
DENJIR: It’s now 24.56 degrees. Simply shaking the bottle raised the water temperature. Water molecules are constantly moving because of thermal motion. Shaking the bottle increases thermal motion. More thermal motion means a higher temperature. The same thing happens with the metal rod. Repeatedly striking it increases thermal motion, and that’s why the temperature goes up.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
Негізгі бет Start a Fire by Striking Metal? / Mr. Denjiro’s Happy Energy!
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