Question

Example 2.7: A capillary tube of radius
5 x 10-m is immersed in a beaker filled
with mercury. The mercury level inside the
tube is found to be 8 x 10 m below the level
of reservoir. Determine the angle of contact
between mercury and glass. Surface tension
of mercury is 0.465 N/m and its density is
13.6 x 10 kg/m°. (g = 9.8 m/s)​

Answer 1

Answer:

Explanation:

Here, θ=140  

o

,r=1×10  

−3

kgm

S=0.465Nm  

−1

,ρ=13.6×10  

3

kgm  

−3

 

As h=  

rρg

2Scosθ

​  

=  

10  

−3

×13.6×10  

3

×9.8

2×0.465×(cos180  

∘

−140  

∘

)

​  

 

=−5.34×10  

−3

=−5.34m