What is the minimum size of glass tube

What is the minimum size of glass tube that can be used to measure water level if the capillary rise in the tube is to be restricted to 2 mm?

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What is the minimum size of a glass tube that can be used to measure water level if the capillary rise in the tube is to be restricted to 2 mm?

Take surface tension of water in contact with air as 0.073575 N/m





ANSWER= [A] 1.5 cm

Correct answer for What is the minimum size of glass tube is 1.5 cm.

Detailed Solution for Civil Engineering Exam

Capillary rise = [(4 σ cosθ) / (γ * d)] = h

if h less than or equal to 2 mm

(4 σ cosθ)/(γw * d ) ≤ 2 mm

d ≥ (4 σ cos θ) / (γw * 2 mm)

dmin = (4 σ cos θ)/(γw * 2 mm)

for water glass contact, θ = 0

dmin = (4 σ)//(γw * 2 mm)

dmin = 4 * 0.073575 N/m/(9810 N/m3 * 2 * 10-3 m)

dmin = 0.015 m = 15 mm = 1.5 cm


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