Question

The contact angle between pure water and pure silver is 90°. If a capillary tube made of silver is dipped at one end in pure water, will the water rise in the capillary?

Answer 1

Explanation:

No. The rise of liquid in a capillary tube is given as, h = 2S*cosθ/(rρg) Where S = Surface tension, θ = the angle of contact between the liquid and the wall of the tube, r = radius of the radius of the capillary tube, ρ = density of the liquid and g = acceleration due to gravity. Here given that θ = 90°, hence cosθ = 0. ∴ h = 0.

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Answer 2

Water won't come up in that capillary tube of pure silver.

Explanation:

No. Liquid increase in a capillary tube is indicated as,

$h=\frac{25 \times \cos \theta}{r \rho g}$

Where,

S is surface tension

θ is the contact angle between  the pipe wall  and  the liquid ,

R is radius of that capillary tube,

ρ is liquid density

and

g = due to gravity acceleration.  

In this case, given that θ = 90°,  

hence cosθ = 0.  

h = 0.  

So, Water won't come up in that capillary tube of pure silver.