11.8 Cohesion and Adhesion in Liquids: Surface Tension and Capillary Action

What is the pressure inside an alveolus having a radius of $2 . \text{50} \times \text{10}^{- 4} \text{m}$ if the surface tension of the fluid-lined wall is the same as for soapy water? You may assume the pressure is the same as that created by a spherical bubble.

What is the gauge pressure in millimeters of mercury inside a soap bubble 0.100 m in diameter?

the figure(a) shows the effect of tube radius on the height to which capillary action can raise a fluid. (a) Calculate the height $h$ for water in a glass tube with a radius of 0.900 cm—a rather large tube like the one on the left. (b) What is the radius of the glass tube on the right if it raises water to 4.00 cm?

What fluid is in the device shown in the figure if the force is $3 . \text{16} \times \text{10}^{- 3} \text{N}$ and the length of the wire is 2.50 cm? Calculate the surface tension $\gamma$ and find a likely match from the table.

Calculate the gauge pressures inside 2.00-cm-radius bubbles of water, alcohol, and soapy water. Which liquid forms the most stable bubbles, neglecting any effects of evaporation?

Calculate the contact angle $\theta$ for olive oil if capillary action raises it to a height of 7.07 cm in a glass tube with a radius of 0.100 mm. Is this value consistent with that for most organic liquids?

Calculate the ratio of the heights to which water and mercury are raised by capillary action in the same glass tube.