0 votes
1.0k views
in Chapter2:Mechanical Properties of Fluids by (98.9k points)
edited

An air bubble of radius 0.2 mm is situated just below the water surface. Calculate the gauge pressure. Surface tension of water = 7.2 x10-2 N/m. 

1 Answer

0 votes
by (98.9k points)
selected by
 
Best answer

Correct Answer: 720 N/m2 

Explaination::

Given : Radius of bubble =0.2 mm =2×104m  , surface tension of water = 0.072 N/m = 720×104N/m 

We know that, excess pressure inside a air bubble in a liquid is given by

Where, t = surface tension of liquid r = radius of bubble

Thus, 

The gauge pressure = 2×720×1042×104 = 720 N/m2

 

Related questions

Doubtly is an online community for engineering students, offering:

  • Free viva questions PDFs
  • Previous year question papers (PYQs)
  • Academic doubt solutions
  • Expert-guided solutions

Get the pro version for free by logging in!

5.7k questions

5.1k answers

108 comments

622 users

...