State of Aggregation of the Flowing Stream Microfluids and Macrofluids Gases and ordinary Noncoalescing droplets not very viscous Solid particles liquids Very viscous liquids Microfluid Macrofluid Molecules are kept Individual molecules are free grouped together in to move about and intermix aggregates or packets Figure 11.2 Two extremes of aggregation of fluid. 33 • State of Aggregation of the Flowing Stream • Microfluids and Macrofluids