An oblique shock is a type of shock-wave. Its name is strictly connected to the shock orientation with respect to the flow direction. Indeed, the shock is at a certain angle "beta" with respect to the flow direction. A particular case of oblique shock is when beta=90 deg., in this case the oblique shock becomes a normal shock. In order to analyze the properties of a flow passing through an oblique shock the normal shock equations can be used combined with the theta-beta-Mach relation to close the problem. The *theta-beta-Mach* relation is generally presented in a form of a plot that defines what would be the shock angle based on the body geometry and the flow Mach number.

The oblique shock can have two solutions per case: the* strong shock* and the *weak shock* solutions. Weak shocks are the majority of the phenomena that can be seen, while strong shocks are generally enforced by particular operating conditions. For a flow passing through a strong oblique shock the mach number past the shock is always subsonic. If the flow passes through a weak shock, in most of the cases the Mach number would be still supersonic, but there are specific situations where the flow will become subsonic past the shock.