Assume that the flowrate, \(Q\), of a gas from a smokestack is a function of the density of the ambient air, \(ho_{a}\), the density of the gas, \(ho_{g}\), within the stack, the acceleration of gravity, \(g\), and the height and diameter of the stack, \(h\) and \(d\), respectively. Use \(ho_{a}, d\), and \(g\) as repeating variables to develop a set of pi terms that could be used to describe this problem.