1. Determine the capillary rise for a water-air-glass interface at 40°C in a clean glass tube having a radius of 1 mm.
2. Determine the difference in pressure between the inside and outside of a soap film bubble at 20 °C if the diameter of the bubble is 4 mm.
3. An open, clean glass tube, having a diameter of 3 mm, is inserted vertically into a dish of mercury at 20°C. Determine how far the column of mercury in the tube will be depressed for a contact angle of 130°.