: irregular solid produced fm disintegration of parent material by crushing, grinding, etc.
: dust particle but with aspect ratio L/W > = 3
: produced fm combustion of organic matter (spherical particles)
: produced fm condensation of vapor/gaseous combustion product (spherical particles), very small when produced, tend to agglomerate; e.g. fm welding, brazing
: liquid particle formed fm condensation/atomization
- fog: visible mist
- smog: smoke & fog; photochemical rxn products