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Atmospheric Pressure

A tube of ins...

Question

A tube of insufficient length is immersed in water (surface tension $= 0.07 N / m$ ) with $1 c m$ of it projecting vertically upwards outside the water, What is the radius of meniscus? Radius of tube $= 1 m m$

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Solution

$h = \frac{2 T}{R ρ g}$ ( $R =$ radius of meniscus at the top)
$∴$ $R = \frac{2 T}{h ρ g} = \frac{2 \times 0.07}{(10^{- 2}) (10^{3}) (10)}$
$= 1.4 \times 10^{- 3}$ m
$= 1.4$ mm

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