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Reference.org
Spark (fire)
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<p>A spark is an <a href="/facts/Incandescence/8Tng7IuE">incandescent</a> <a href="/facts/Particle/JHKr2w6h">particle</a>. Sparks may be produced by <a href="/facts/Pyrotechnic/Gocs5Gcu">pyrotechnics</a>, by <a href="/facts/Metalworking/eAT0Pvz2">metalworking</a> or as a by-product of <a href="/facts/Fire/M6XwR3am">fires</a>, especially when burning <a href="/facts/Wood_fuel/S6W7k5Pv">wood</a>. </p>