As I know Kortweg de Vreis equation is a tool to illustrate natural phenomena Ok! now the phenomena here is so called '''magneto-hydrodynamic'''': The following expression taken from an paper : ''''''''Since Gardner and Morikawa [3] have rediscovered that the Korteweg-de Vries equation valids also for nonlinear magneto-hydrodynamic wave propagating'''''''''' How the term ''''magneto-hydrodynamic''' found in the nature or what presents?