The Mach effect can refer to:
- Mach bands are an optical illusion that are often referred as "the Mach effect".
- Mach's principle – a hypothesis attempting to explain a frame of reference for rotation
- Mach effect or Mach effects (for spacecraft propulsion) – see Woodward effect
- Mach-effect thruster – a hypothetical reactionless drive
- Mach effect or Mach effects (for spacecraft propulsion) – see Woodward effect
See also
- Sonic boom, an effect of traveling at Mach speeds in fluids
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