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2 answers

Just a couple of considerations

temperature stability

particle size distribution

particle durability

2006-07-05 06:50:24 · answer #1 · answered by Robert A 5 · 0 0

i donno how else to answer your non-specific answer - i can only give you a rough guess that materials that are easily 'moved' using fluids such as air/water.

2006-07-01 22:38:37 · answer #2 · answered by Yue C 1 · 0 0

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