In order that a droplet of water at $20^{0} C$ $(σ = 0.0728 N / m)$ has an internal pressure 1 kPa greater than that outside it, its diameter should be nearly

- 1
  
  0.15 mm
- 2
  
  0.3 mm
- 3
  
  0.6 mm
- 4
  
  1.2 mm

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