What you will need?
● 2 soda cans
What to do?
Hold 2 empty soda cans next to each other. Once you feel the cans are almost touching, take a deep breath and blow towards the area where they almost touch.
What’s going on?
Every sound that you’ll ever hear is caused by vibration. It’s that vibration that causes sound/noise. In this case, when you blow between the cans, the air particles at high speed bounces around in the space between the two cans, giving a vibration. By placing the cans close to one another, you are giving the air particles less room to move at a faster speed. This creates a strong screeching sound.