If the velocity, bulk modulus of elasticity and the mass density of a fluid are denoted by U, K and $ρ$ respectively, then the Mach number is given by

- 1
  
  $\frac{U \sqrt{K}}{\sqrt{ρ}}$
- 2
  
  $\frac{U \sqrt{ρ}}{\sqrt{K}}$
- 3
  
  $\frac{ρ \sqrt{U}}{\sqrt{K}}$
- 4
  
  $\frac{K \sqrt{U}}{\sqrt{ρ}}$

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