How Sound is formed?

Sound Waves

Sound is formed when something vibrates. Vibrations cause the surrounding environment to change its pressure. This pressure difference move away from the sound source, creating sound waves. Therefore, sound is dependent on the environment. Playing drums in open air and under water would create different sound waves.


Main characteristic of a sound wave is its frequency. Frequency is the measurement of vibration in a certain time interval. Its unit is Hertz (Hz) which can be defined as number of vibrations per second.

High Frequency

High frequency means more vibrations in a second(bigger Hertz)

Low Frequency

Low frequency means less vibrations in a second(smaller Hertz)

Next we will learn about how sound is formed on guitar, piano and ukulele.