The Mach Effect can refer to one of the following two things:
- Mach bands are an optical illusion that are often referred as "the Mach effect".
- The Woodward effect is a purported physics-related, propulsion phenomenon, commonly referred as "the Mach effect". Technically, Woodward refers to "Mach effects" within Einstein's theory of general relativity.
- Sonic boom, an effect of travelling at Mach speeds in fluids
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