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Engineering Sciences
Aerospace Engineering
1887
Intermediate

Mach Number

M=vcM = \frac{v}{c}

Flow speed divided by speed of sound—classifies compressibility effects.

By Ernst Mach

Engineering Sciences
Mach Number
1887 · Ernst Mach
Why it matters: Essential for supersonic aircraft, rockets, and shock wave physics.

Discoverers: Ernst Mach (1887)

What does it mean?

Flow speed divided by speed of sound—classifies compressibility effects.

Why should I care?

Essential for supersonic aircraft, rockets, and shock wave physics.

Variables & Units

SymbolNameUnitMeaning
MMMach number—Dimensionless
vvFlow velocity—m/s
ccSpeed of soundm/sLocal sound speed

Worked Example

M=2 means flow at twice local sound speed (supersonic).

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Sources & further reading

Search WikipediaSearch Wolfram MathWorldOpen in Wolfram|AlphaWatch explainers on YouTube

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Mach Number

M=vcM = \frac{v}{c}

Real-world impact

Space systems

Orbital mechanics enables global connectivity and exploration.

Photo: Unsplash — rocket launch

Flow speed divided by speed of sound—classifies compressibility effects.

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