For the Hg‒air interface on glass, θ = 140°. Find the capillary depression of Hg in contact with air at 20°C in a glass tube with inside diameter 0.350 mm. For Hg at 20°C, ρ = 13.59 g/cm3 and γ = 490 ergs/cm2. (See Prob. 7.54).
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