Helium gas is used to inflate a weather balloon at ground level. The balloon is then allowed to rise to an elevation of several kilometres. (2) Why is it wise not to inflate the balloon fully? (b) Suppose 2.2 m of helium is pumped into the balloon at ground level where the temperature is 20C and atmospheric pressure is 101 kPa. At an elevation of 6000 m, atmospheric pressure is 51 kPa and the temperature is 48C. Calculate the volume of the helinvm. {Assume that the balloon is still not fully inflated.)