The differential equation for energy for a reversible adiabatic flow may take the form

- 1
  
  $d p + d (ρ V^{2}) = 0$
- 2
  
  $V d V + e^{2} \frac{d ρ}{ρ} = 0$
- 3
  
  $2 V d V + \frac{d ρ}{ρ} = 0$
- 4
  
  $V d V + \frac{d ρ}{ρ} = 0$

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