In analogy to an electrical transport line it is asumed that the mechanical system, used during the following considarations, consists of straight, long and thin tubes. Differences within a cross section of the tube can be neglected.
Furthermore, it is assumed that the internal gas or liquid should flow only with a rather small drifting speed so that no effect of turbulance will occor.
Under these conditions, the phenomena "propagation" "superposition" and "reflection" can be described in a first approximation by the same laws and algorithms as those for an electrical transport line or double line.
To study the dynamic behavior of gases basic knowledge is required about the molecular structure of this form of matter, about the difference between thermal motion and drift motion, about the definition of pressure,and others.
Appropriate information can be found in
Basics (mechanical)

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