Results from numerical computations performed to represent the transient behavior of axisymmetric non-vaporizing and vaporizing sprays injected into a constant volume chamber are presented. These results are compared with those from vaporizing spray experiments where, for the same mass and momentum flow rates, the effect of chamber density on spray penetration and dispersion angle was studied. It is shown that with the practical numerical resolution employed here, which appears to be inadequate, the results do not agree. Higher resolution is impractical from a numerical point of view for sprays. Hence, the present work further explores whether gas jets, which may be computed with a high resolution, are comparable to the sprays in terms of penetration and dispersion angle. For each gas jet computation, the injected mass and momentum flow rates and the chamber density in the corresponding gas jet computations are maintained the same as those in the spray experiments. Comparisons show that the gas jet penetration and angles are in agreement with the trends of the spray measurements. In both cases, the penetration decreases with increasing chamber density and the dispersion angle increases.