Perhaps it should be equal to acoustic speed. ----- Original Message ----- From: "DjArcas" <djarcas at hotmail.com> To: <bernd129 at web.de>; <ode at q12.org> Sent: Sunday, December 28, 2003 5:45 AM Subject: Re: [ODE] Shockwave of an explosion Curious, how 'fast' would an explosion shockwave be, anyways?