In a compressible flow, the area of flow, the velocity of flow and the mass density are denoted by a, v and m respectively. At a particular section, the differential form of the contuity equation is given by

- 1
  
  $\frac{d a}{a} = \frac{d v}{v} + \frac{d m}{m}$
- 2
  
  $\frac{d a}{a} = \frac{d v}{v} - \frac{d m}{m}$
- 3
  
  $\frac{d a}{a} = - \frac{d v}{v} + \frac{d m}{m}$
- 4
  
  $\frac{d a}{a} = - \frac{d v}{v} - \frac{d m}{m}$

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