What is considered to be the audio frequency range of human hearing?

The audio frequency range of human hearing is widely accepted to be from approximately 20 hertz to 20 kilohertz. This range encompasses the frequencies that the average human ear can detect, with 20 hertz representing the lower limit of where sound can be perceived and 20 kilohertz being the upper limit. Sounds below 20 hertz are classified as infrasound, while those above 20 kilohertz fall into the category of ultrasound, both of which are generally inaudible to humans. Understanding this range is crucial for applications in audio engineering, broadcasting, and sound design, as it informs the design of equipment and the selection of material that will produce sound within the audible spectrum for effective communication and enjoyment.