A dimensionless combination of surface tension $σ$ , density $ρ$ , diameter D and velocity V is

- 1
  
  $σ D / ρ V$
- 2
  
  $σ D^{2} / ρ V$
- 3
  
  $σ / ρ V^{2} D$
- 4
  
  $σ D / ρ V^{2}$

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