Propagation and interaction of waves in a non-ideal gas

The propagation of disturbances through a non-ideal medium, where of relati vely undistorted waves is used to study the situations when the disturbance amplitude is finite, arbitrarily small, and not so small. The effects of t he solid particles and that of the non-planar wave front configuration on t he distortion attenuation, and shock formation of propagating pulses are de scribed in detail. The resonant multiwave theory of weakly nonlinear geomet rical optics, which takes into consideration systems where many waves coexi st and interact with one another resonantly, is applied to derive transport equations for signals having all possible wave modes which are mutually co upled and interact resonantly among themselves.