Frequency is the technical term for the pitch of sound. It is measured in Hertz (Hz). Humans can hear sounds between about 20Hz-20,000Hz. Some animals can hear much lower and higher frequency sounds.
Intensity is another word for loudness and is measured in decibels (dB). Normal hearing people can detect sounds at 0dB. Sounds become uncomfortably loud at about 120dB. Our ears are very sensitive and can detect a 1dB difference in loudness.
The comparison pictures show the difference in the amplitude level (Pg) of loud and quiet sounds.
An audiogram is a chart that shows the results of a hearing test, with figures representing frequency (Hz) and Intensity (dB). It is the primary information used for programming hearing aids.
The figure shows an example that shows the sensitivity of an individual to a certain range of frequencies, and also demonstrates speech sounds and other familiar sounds of the environment at their approximate levels.
Audiology is a branch of science that studies hearing, balance, and related disorders. The central focus of the profession of audiology is concerned with all auditory impairments and their relationship to disorders of communication. Audiologists identify, assess, diagnose, and treat individuals with impairment of hearing and/or balance function, and strive to prevent such impairments.