____ dispersions contain large particles (10-50 µm)

____ dispersions contain large particles (10-50 µm)

• A. coarse
• B. fine
• C. colloidal
• D. very fine

Answer: (A)

Particle size determines how a dispersion is classified. Coarse dispersions have relatively large particles, typically greater than 1 µm and often in the tens of micrometers. A range of 10–50 µm fits this category, so the system behaves like a suspension or emulsion with visibly large particles that tend to settle and require stirring to stay uniform. Smaller ranges correspond to finer dispersions or colloidal systems, where particles are in the submicron or nanometer scale and remain dispersed more easily due to Brownian motion. Thus, 10–50 µm is characteristic of coarse dispersions.

Particle size determines how a dispersion is classified. Coarse dispersions have relatively large particles, typically greater than 1 µm and often in the tens of micrometers. A range of 10–50 µm fits this category, so the system behaves like a suspension or emulsion with visibly large particles that tend to settle and require stirring to stay uniform. Smaller ranges correspond to finer dispersions or colloidal systems, where particles are in the submicron or nanometer scale and remain dispersed more easily due to Brownian motion. Thus, 10–50 µm is characteristic of coarse dispersions.