The end of a capillary tube with a radius r is immersed into water. What amount of heat will be evolved when the water rises in the tube? If surface tension of water ‘T’ density of water = ρ . Given 
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(4)
Sol. Here, the work done by surface tension force is being converted into gravitational potential energy
and heat.
so W Fs = U g + heat
⇒ (2 π r) (T) × (h) = mg h/2 + heat {h/2 because of P. E. of com.}
⇒ 2 π T × r × 
= 
+ heat
get heat evolved = 
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