There are different kinds of sparks, but the
spark you mean here is the kind associated with
fire (as opposed to electricity). The sparks
associated with fire are incandescent particles,
which means they emit light because they are hot.
These "fire sparks" are a special case of thermal
radiation. Electrical sparks, on the other hand,
are formed when an electric field creates a
channel that is ionized and electrically
conductive in the air.
Triboluminescence is a different phenomenon
also: light is generated via the breaking of
chemical bonds, as opposed to simple heating of
the material, as is the case with "fire sparks."
These chemical bonds break when some material is
ripped, rubbed, scratched, crushed, or pulled
apart, and the mechanism is not entirely
understood. I hope this helps!
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