SCIENCE|natural and applied sciences|earth sciences
 - frithchaitheamh Mach Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
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- Mach reflection
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- Definition a configuration of intersecting shock waves for which no solution with simple oblique waves is possible.Normally it consists of a triple intersection involving a normal shock and two oblique shocks Reference Multilingual Aeronautical Dictionary(AGARD,1980)