Wax is coated on the inner wall of a capillary tube and the tube is then dipped in water. Then, compared to the unwaxed capillary, the angle of contact θ and the height h upto which water rises change

Question

Wax is coated on the inner wall of a capillary tube and the tube is then dipped in water. Then, compared to the unwaxed capillary, the angle of contact θ and the height h upto which water rises change. These changes are :

TestHub · Accepted Answer

Angle of contact θ cos θ = T LA ​ T SA ​ − T SL ​ ​ when water is on a waxy or oily surface T SA ​ < T SL ​ cos θ is negative i.e., 9 0 ∘ < θ < 18 0 ∘ i.e., angle of contact θ increases And for θ > 9 0 ∘ liquid level in capillary tube fall. i.e., h decreases

Physics - Fluid Question with Solution | TestHub

Options:

Doubts & Discussion