On the Propagation of Longitudinal Stress Waves in Solids and Fluids by Unifying the Navier-Lame and Navier-Stokes Equations

Figure 4

The distance between the particles at the time .

(a) The distance between the particle originally located in the origin and the same particle moved away from the origin in time

(b) The distance between the particle at the time and the same particle approaching its equilibrium position at the origin

(c) The distance between the particles located in their respective equilibrium position and the same particles moved away from the equilibrium position in time