Introduction

Sound is a longitudinal wave of pressure that travels through compressible medias, which can be solid, liquid, gaseous, or made of plasma.

Frequency is the number of occurrences of a repeating event per unit of time. The perception of frequency is called pitch.

Sound can be produced by many different devices. A vibrating string or air column can both create music and have unique properties.

Sound quality is an assessment of accuracy or enjoyability of how a sound is perceived.

The speed of sound is is the distance traveled in a unit of time by a sound wave through an elastic medium, and is usually given as 344 m/s.