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through any physical material that is transparent to the specific wavelength , such as water , air , glass , or concrete . sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. historically, science
of guided media include phone lines, twisted pair cables, coaxial cables , and optical fibers. unguided transmission media are methods that allow the transmission of data without the use of physical means to define the path it takes. examples of this include microwave , radio or infrared . unguided...
https://en.wikipedia.org/wiki/Transmission_medium
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