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<p>for a material to reach its autoignition temperature  when exposed to a <a href="page.php?w=heat_flux">heat flux</a>  is given by the following equation:</p>

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:</p>

<p>where k = <a href="page.php?w=thermal_conductivity">thermal conductivity</a>, ? = density, and c = <a href="page.php?w=specific_heat_capacity">specific heat capacity</a> of the material of interest,  is the initial temperature of the material (or the temperature of the bulk material).</p>

<p><big>Autoignition temperature of selected substances</big></p>
<p>Temperatures vary widely</p><p>
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