7) Consider a column that extends from the surface to the top of the atmosphere. The cross sectional area of the column is 1m2 and the pressure at the surface, i.e., at the bottom of the column, is 1013mb. Take the average temperature in the column to be T a) Using the following approximate expression for atmospheric pressure variations with height, .e., p(z) = Po exp(-RT and the ideal gas law compute the total number of air molecules in the column. Yon will have to perforn an integral to solve this