校 長  楠野 宣孝

【English version】”The Power of Foams and Bubbles.”

Foams and bubbles play a number of important roles around us. The properties of foam, such as absorption and insulation, make them ideal to be used in a wide variety of ways, such as in various detergents, cleaners, and fire extinguishers. Other than this, they are also used to create unique tastes such as carbonated beverages and whipped cream, and for keeping fish and crops fresh. There are also creatures that make nests with bubbles to keep their spawn safe, and lay eggs in clusters of bubbles.

The sizes of most of the bubbles which can be seen in everyday life, called “centibubbles,” are of several centimeters in diameter and “millibubbles” of several millimeters. Bubbles smaller than this are known as “microbubbles,” and even smaller ones are called “ultra-fine” bubbles. As the size becomes finer, bubbles develop various properties, making more practical use possible. Even though they are such small things and seem so fragile like the word “bubbly” indicates, they are widely used in many fields and have incredible powers. Currently, we are also developing technology to produce bubbles on the bottom of large passenger ships to reduce frictional resistance.

There is a saying that “The Japanese pepper is very small yet terribly spicy”, which implies, “Small he may be, but he is not a man to be trifled with.” And the same thing can be said about bubbles. Likewise, one technique in metal processing, called “shot peening,” involves colliding millions of small metal spheres with a metal surface at high speed, making the metal surface very strong. This technique is used for automobile parts such as springs, gears and crankshafts and for aircraft applications such as jet engines and wings. Again, we can find a lot in common with bubbles and foams. Small balls create huge power.

I like this kind of example very much and I talked about a lot of similar stories to the students in the school’s opening ceremony and the closing ceremony this year. “If you keep on doing small things, your heart grows stronger, and will eventually become a big force.” I have talked at several schools as principal giving various examples like this and I am pleased if even one of my students remembers the message I wanted to convey.

Principal Nobutaka Kusuno