Acoustics deals with the study of sound that is of mechanical waves in liquids, gases and solids. The term ‘acoustic’ comes from ancient Greek and it refers to the ability of being heard. Acoustics studies the sound from production and control, through transmission and to reception and effects. The initial studies focused on mechanical vibrations and their radiations through mechanical waves. These studies are still continuing in the present. Waves and sound involve physical processes, which, in their turn, have various aspects that researchers are trying to focus on at the moment.