Final answer:
Liquid pharmaceutical formulations are classified as solutions, colloids, or suspensions depending on the size of the dispersed particles.
Step-by-step explanation:
Liquid pharmaceutical formulations are classified depending on the size of dispersed particles as solutions, colloids, or suspensions. Solutions are composed of particles the size of an ion or small molecule (~0.1-2.0 nm), while colloids have larger particles (~2.0-500 nm). Suspensions have particles larger than 500 nm and are heterogenous mixtures in which the particles will settle upon standing.