Audio means Sound! Anything that is audible is audio. It exists in the form of sound that is nothing but a vibration which is transmitted through solid, liquid, or gas.
In general, audio means those vibrations composed of frequencies capable of being detected by ear.
Audio, involves those mechanical vibrations that can be annotated as sound and the ones that have the capacity to travel through all forms of matter: gases, liquids, solids, and plasmas. They are heard by a normal being easily. And that is why they should fall under a particular range that matches the hearing capacities of our ears. The matter that supports the sound is called the medium. But the vibrations of sound cannot travel through vacuum.
Sound waves or audio waves are characterized by keeping a lot of factors in mind. Some of the most important factors of them all are: the generic properties of waves, what is the exact frequency of the waves, what is its amplitude, intensity, at what speed they are traveling in a definite medium, what is the wavelength, and different other factors. On the other hand, transverse waves, have an additional property of polarization. The science that deals with the study of sound, ultrasound and infrasound is known as Acoustics.
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