Diy: make a loud air horn and explore the mystery of acoustics

“owzura” is an air loudspeaker for power, the first of its kind, an acoustic tool made from the horns of antelope to drive out baboons. You know, with readily available material, we can make a funny air horn。

Production materials

Thermal smelting, balloons, emptiness bottles for larvae, rubber bands, scissors and straws。

Production process

A small hole with a diameter of 0. 5 to 1 cm was dug with scissors at the bottom and the lower of the side of the larvae bottle, respectively。

Cuts the balloon, turns the balloon skin over to the mouth of the carton, tightens the balloon skin and binds it with rubber bands。

Two straws are inserted from the side of the bottle and from the bottom, respectively, and attention is drawn to the penetration of the bottom straw to reach the balloon skin. It then fills the gap between the straw and the bottle with thermal melt. So we finished the air horn。

It's amazing how the mouths of the saloon can sound like oozing。

Scientific principles

At first, the cauldron is closed, and when it breathes into it, the pressure increases and the balloons are pressured on the flexible skin; when the balloon's skin is pushed out of pressure and there's a gap between the straw, the air flows out; the air flows out, the air pressure lowers, and the balloon returns to its original position, closing again. So many times, the balloon skin is formed to vibrate back and forth, and thus the air vibrations sound。

Try it

Change straws of different sizes, how do they compare their sound? And try to explain the science。