What type of solution contains particles that can be seen and settled?

A suspension is a type of solution where the particles are large enough to be seen and can settle out over time due to gravity. In a suspension, the solid particles do not dissolve in the liquid, and as a result, they maintain a distinct and visible presence. This characteristic distinguishes suspensions from other types of solutions, such as colloids and true solutions.

In a true solution, the solute particles are so small that they cannot be seen with the naked eye and remain uniformly distributed in the solvent, meaning they do not settle out. Colloids also contain particles that are larger than those in a true solution but smaller than those in a suspension. While colloidal particles do not settle out quickly like those in a suspension, they can still scatter light, resulting in phenomena such as the Tyndall effect.

Concentration, on the other hand, refers to the amount of solute in a given volume of solvent and does not describe the visibility or behavior of particles in a solution.