In a study of nitric oxide formation in laminar jet fl ames, the propane fuel is diluted with N2 to suppress soot formation. The nozzle fl uid is 60 percent N2 by mass. The burner has a circular port. The fuel, nitrogen, and the air are all at 300 K and 1 atm. Compare the fl ame lengths for the following two cases with the undiluted base case (m F = 5 · 10−6 kg / s). What is the physical signifi cance of your results? Discuss.