The lowest ignition energy value occurs at the stoichiometric combustion concentration. For most materials this can be calculated from the carbon and hydrogen content and is typically about twice the lower flammable limit (LFL)  .
 For most materials the stoichiometric concentration can be calculated from the carbon and hydrogen content and is typically about twice the lower flammable limit (LFL) . The lowest ignition energy value rarely occurs at the stoichiometric combustion concentration. For heavier gasses, the minimum usually occurs slightly above stoichiometric concentration and for lighter gasses such as Hydrogen, slightly below .
D
The lowest ignition energy value occurs at the stoichiometric combustion concentration.
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this
the stoichiometric concentration
A
. The lowest ignition energy value rarely occurs at the stoichiometric combustion concentration. For heavier gasses, the minimum usually occurs slightly above stoichiometric concentration and for lighter gasses such as Hydrogen, slightly below