Editing Wave (section)

=== Transmission and media ===
{{Main|Rectilinear propagation|Transmittance|Transmission medium}}

Waves normally move in a straight line (that is, rectilinearly) through a ''[[transmission medium]]''. Such media can be classified into one or more of the following categories:
* 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
* An ''anisotropic medium'' if one or more of its physical properties differ in one or more directions
* An ''isotropic medium'' if its physical properties are the ''same'' in all directions