a capillary tube of radius 0.25 mm is immersed in water. the top end of capillary tube projects by 20mm above the surface of water. calculate the radius of curvature of meniscus. surface tension is 72 dyne/cm
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The radius of curvature of meniscus is 0.00073 meters.
Explanation:
The radius of curvature of meniscus is given by the formula:
R = (2T)/(hρg)
Where,
T = Surface tension = 72 dyne/cm = 0.072 N/m
h = Height of the tube = 20 mm = 0.02 m
ρ = Density of water = 1000 kg/m³
g = Acceleration due to gravity = 9.8 m/s²
On substituting the values, we get,
R = (2 × 0.072)/(0.02 × 1000 × 9.8)
R = 0.144/196
∴ R = 0.000734 m
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