The combustion of nanometric aluminum (Al) powder with an oxidizer such as molybdenum trioxide, MoO3 is studied analytically. The analysis was performed to correlate individual Al particle gasification rates to macroscopic flame propagation rates observed in flame tube experiments. A liquid droplet evaporation model is applied. Results show that particles below about 23 nm in diameter evaporate before appreciable chemical reactions occur. The resulting gas mixture would then burn as a gaseous premixed flame, producing solid particles as combustion products. Activation energy and pre-exponential factors are examined from the literature for both solid-state and gas phase Al reactivity models. The analytical results show good agreement with experimental observation only for the gas phase reactivity models. These results suggest that macroscopic flame propagation in a tube with sufficiently small particles can be modeled as laminar premixed gas flame.