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List of art media (plural: media), materials and techniques used by an artist to produce a work; Medium, an American television series starring Patricia Arquette about a medium (psychic intermediary) working as a consultant for a district attorney's office; Medium Productions, a record label; The Medium, a 1946 opera by Gian-Carlo Menotti
Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves.
The medium mentally "hears" (clairaudience), "sees" (clairvoyance), and/or feels (clairsentience) messages from spirits. Directly or with the help of a spirit guide, the medium passes the information on to the message's recipient(s). When a medium is doing a "reading" for a particular person, that person is known as the "sitter".
In optics, an optical medium is material through which light and other electromagnetic waves propagate. It is a form of transmission medium . The permittivity and permeability of the medium define how electromagnetic waves propagate in it.
A forest is an example of an excitable medium: if a wildfire burns through the forest, no fire can return to a burnt spot until the vegetation has gone through its refractory period and regrown. In chemistry, oscillating reactions are excitable media, for example the Belousov–Zhabotinsky reaction and the Briggs–Rauscher reaction.
A bounded medium if it is finite in extent, otherwise an unbounded medium; A linear medium if the amplitudes of different waves at any particular point in the medium can be added; A uniform medium or homogeneous medium if its physical properties are unchanged at different locations in space