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Question

A long capillary tube of radius r-=1 mm open at both ends is filled with water and placed vertically . What will be the height (in cm ) of the column of water left in the capillary in nearest integer ? The thickness of the capillary walls is negligible .(Surface tension of water is 72 dyne/cm and g=1000cm/sec2) .

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Solution

Height of rise in capillary =20cosθPgr
for θ=900
h=2×72cos90×103103×1000×101×102×103N×m3×s2m×kg×n×m

=0.144m
Hence, the answer is 14.4cm.


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