You can also use a 9-volt battery and short out the terminals across the steel wool, the resistive heating should be hot enough to start it lit.
Normally we do not think of iron as being flammable, this is because bulk iron doesn't self-sustain its burning like most flammable materials. But the strands of steel wool are thin enough with enough surface area that heat produced is self-sustaining and will continue to burn through if there is enough air present. You can also use a 9-volt battery and short out the terminals across the steel wool, the resistive heating should be hot enough to start it lit. When steel wool is heated it increases in mass due to the burning iron combining with the oxygen. Very fine steel wool is sometimes carried for use as tinder in emergency situations; it burns even when wet and can be ignited by fire, a spark, or by connecting a battery to produce joule heating.
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