The H2 O2 reaction p-Ta ignition limits in closed vessels

The locus of pressure and ambient temperature conditions that separate 

The reaction in the region above the second limit (i.e., at higher pressure in the slow reaction zone) is sufficiently rapid to be measured with conventional methods the exothermic reaction can support transient temperature excesses (gas temperature being heated above the ambient temperature) of several kelvin [24] as indicated in Fig. 5.17. 

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