5. A thread of mercury of length 16cm is used to trap some air in a capillary tube of uniform cross-sectional area and closed at one end. When the tube is held vertically, with the closed end at the bottom, the length of the trapped air column is 30cm. Calculate the length of the air column when the tube is held, horizontally (11) vertically with the open end underneath. [Atmospheric pressure = 76cm of mercury] NECO 2006 Ans: (i) 36.32cmHg (ii) 46cmHg​