DENJIRO: Today’s topic is knives. I have here different kinds of knives. There are lots of knives out there, but today we’re going to use this long sashimi knife. I have here something called konjac jelly. I’m going to place the knife on the jelly. This alone does not cut the jelly. However, if I pull the knife toward me, then I’m able to cut the jelly. With the sashimi knife, you use the long blade to pull and cut. So why are you able to cut when you pull?
I have here two models of a knife. One has a thin, sharp blade. The other has a thick blade with a larger angle. I’m going to push them against some clay. Of course, it’s easier to cut with the thinner blade, but this is the key point here. Say you bring the knife straight down in relation to the ingredient you’re cutting. Let me show you the cross-section of the blade when that happens. It’s in the shape of a triangle.
Now, if you pull while cutting, that means you’re using the blade diagonally. To show you with the model, you’re cutting along this diagonal line. The cross-section looks like this. It’s a long, thin triangle. If we compare the two triangles, we see that the triangle is sharper and thinner when we pulled the knife, as opposed to when we simply pushed it straight down. That means pulling the blade to use it diagonally allows you to use it as a thin blade.
If you keep using a knife, the blade gets dull. Let me recreate what happens using this box cutter blade. If I press a sausage against the blade, naturally, the blade cuts into the sausage. However, watch what happens if I line up 50 blades.
GIRL: The sausage isn’t getting cut.
DENJIRO: There are about 30 blades coming into contact with the sausage. That means there is about one-thirtieth the force being applied to one blade. When the blade gets thicker, the force when something is pushed against it is dispersed, and as a result, it can’t cut. This is the reason why a blade isn’t able to cut too well when it gets dull.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
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