Civil Engineering - UPSC Civil Service Exam Questions - Discussion

7. 

Surface tension of water when in contact with air is 0.0737 N/m. The difference of pressure between the inside and outside of a droplet of rain water 1 mm in diameter is nearly equal to

[A]. 0.15 kN/m2
[B]. 0.20 kN/m2
[C]. 0.25 kN/m2
[D]. 0.30 kN/m2

Answer: Option D

Explanation:

No answer description available for this question.

Ravi said: (Jul 27, 2015)  
= (4*Surface tension)/Dia.

Shubham Samyal said: (Jun 12, 2018)  
For jet - 2 * s.ten/dia.
For bubble - 8 * s.ten/dia.
For drop - 4 * s.ten/dia.

Mumtaz said: (Jan 24, 2021)  
4 * 0.0737 * 1/1000 * 9.81 * 10-3-0.3kN/m2.

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