+1 vote
in Fluid Mechanics by (118k points)
Find the capillarity rise or fall if a capillary tube of diameter .03m is immersed in  hypothetical fluid with specific gravity 6.5, surface tension 0.25 N/m and angle of contact 147°.

(a) 0.44mm fall

(b) 0.88mm fall

(c) 0.44mm rise

(d) 0.88mm rise

I had been asked this question during an online exam.

This key question is from Surface Tension, Capillarity, Vapour Pressure and Cavitation in division Properties of Fluids of Fluid Mechanics

1 Answer

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Best answer
Right choice is (a) 0.44mm fall

Explanation: h=4*cosθ*σ/ρ*g*d

                       =4*cos147*0.25/6.5*1000*9.81*0.03

                       =-0.44 mm i.e 0.44 mm fall.

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