(a) Explain why it would be an advantage to replace the mercury in an openended manometer with a much lower density liquid such as liquid glycerol when the pressure of the gas sample is close to barometric pressure. (b) A manometer is filled with glycerol (d = 1.26 g mL-1) instead of liquid mercury (d = 13.5 g mL-1). The height of glycerol above a reference point on the open arm of the manometer is 179 mm and the height of glycerol in the gas arm is 136 mm above the same reference point. Calculate the pressure of the gas in the container in bar if barometric pressure is 1.0239 bar. Hint: convert the liquid pressure due to the difference in glycerol levels first to the equivalent liquid pressure in mm Hg