The limbs of manometer consists of uniform capillary tubes of radii 1.4 × 10 –3 m and 7.2×10 –4 m. Find out the correct pressure difference if the level of the liquid (density 10 3 kg/m 3 , surface tension 72 × 10 –3 N/m) in the narrower tube stand 0.2 m above that in broader tube.
Text Solution
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Given: 
Let 
and 
are pressures in wide and narrow tubes. pressure just below the meniscus in wide tube
pressure just below the meniscus in narrow tube
The difference of two pressures 
If angle of contact 
then
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