Bulk material is stuff handled ‘in bulk’. One LEGO piece is a brick but 1,000 poured into a bag is bulk material. Corn starch, sand, flour, powder-coat powder, gravel, cat food, Cap’n Crunch, coins, ...
Compared to fluids, engineers’ training and education in bulk solids handling is lacking. Perhaps that is why it is often easy to identify which lines or equipment in a facility handle powders — they ...