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== Terminology == Shock waves can be: ; Normal: At 90Β° (perpendicular) to the shock medium's flow direction. ; [[Oblique shock|Oblique]]: At an angle to the direction of flow. ; [[Bow shock (aerodynamics)|Bow]]: Occurs upstream of the front ([[bow (ship)|bow]]) of a blunt object when the upstream flow velocity exceeds Mach 1. Some other terms: * Shock front: The boundary over which the physical conditions undergo an abrupt change because of a shock wave. * Contact front: In a shock wave caused by a driver gas (for example the "impact" of a high explosive on the surrounding air), the boundary between the driver (explosive products) and the driven (air) gases. The contact front trails the shock front.
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