“…This law has been reported for single particles burning in air with different temperatures and oxygen concentrations [16], for particles 40-200 µm in diameter [21], and also for aerosol combustion of 30-µm particles [5]. The same combustion law was obtained for Mg particles burning in an environment of carbon oxides [22] and nitrous oxide [23]; consequently we expect that γ = 2. However, for very small particles, the combustion rate may be governed by its kinetics, so the value of γ could be equal or close to one.…”