(a) What is surface tension? (b) A small bubble of air in water (=0.073Nm1) has a radius of 0.10mm. Find the difference in pressures between the inside and outside of the bubble. (c) A drop of oil (=0.0320Nm1) has a radius of 0.0100mm. The drop is located a distance of 2.55m below the surface of fresh water at 298K. The atmospheric pressure above the water is 1.01105Pa. Determine the absolute pressure inside the oil drop. [Hint: Ptotal=Phydrostatic+Patmospheric] (d) A Wilhelmy plate with dimensions 5cm long and 2mm wide is at rest just rest on the surface of a water-air interface. Assuming perfect wetting, what is its weight (in N) measured by the tensiometer, assuming the weight of the plate has been accounted for? The surface tension of water =0.07Nm1