Ignition temperature organic compounds

Contact of barium peroxide and water will readily produce a temperature and a local oxygen concentration high enough to ignite many organic compounds. 

Although cotton textiles and wood burn in a similar manner, the cotton fibers catch fire and bum more readily than wood, once the ignition temperature is reached, because the fibers are sufficiently exposed to the air to make rapid combustion possible. However, this is somewhat offset by the presence in woods of lignin and other aromatic organic compounds which, under the influence of heat, can give rise to highly flammable gases. 

Mixtures that are fuel-rich or fuel-lean ignite at higher temperatures than do those of intermediate compositions. Also, in a homologous series of organic compounds, the AIT decreases with increasing molecular weight, as shown in Fig. 3.4. 

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