Civil Engineering MCQAE Level Civil Engineering
The rise of liquid in a capillary tube of radius r (surface tension sigma, contact angle theta) is given by:
Fluid MechanicsSurface TensionMEDIUM
Choose the correct answer
A
h = 2 sigma cos(theta) / (rho g r)
B
h = sigma / (rho g r)
C
h = rho g r / sigma
D
h = 2 r sigma / g
Correct Answer
A. h = 2 sigma cos(theta) / (rho g r)
Why is this the answer?
Capillary rise: h = 2 sigma cos(theta) / (rho x g x r). For water in glass (theta = 0): h = 2 sigma / (rho x g x r). Capillary rise is significant in small tubes and fine-grained soils.
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