It is well known that you can trap liquid in a drinking straw by placing the tip of your nger over the top while the straw is in the liquid and then lifting the straw out. The density of water is 1.0 g/cm3, and assume atmospheric pressure is 101.3 kPa. When the straw has been removed from the liquid:
a) If the straw has a radius of 2.0mm, and you have trapped a column of water which is 10 cm high, determine the gas pressure between the liquid and your nger. Give your answer as a percentage of atmospheric pressure (i.e. P = Patm).