ABSTRACT
Sound is normally understood to mean elastic molecular oscillations in the air or other media such as water, iron, or concrete. The speed of sound in water or ice also comes into play when doing underwater sound recordings and underwater sound design. Sound is a pressure disturbance in the air that can be perceived by hearing. However, the sound does not necessarily have to be audible. Infrasound and ultrasound, which are below and the normal range of human hearing, respectively, are examples of inaudible sounds. Sound propagates by an oscillating solid body setting the particles next to it in motion, and those next to them, and so on. The sound spreads with a certain propagation velocity. This is called the speed of sound, which varies depending on the medium. The speed of sound in water or ice also comes into play when doing underwater sound recordings and underwater sound design.
