The size of particles of true solutions is?

True solutions are challenging to filter or separate because they become entirely dissolved in the solvent. Each and every homogeneous mixture of two or more substances that includes a particle size of less than ${10}^{-9} m$  or $1\mathit{ nm}$ is considered to constitute a homogeneous solution.

A true solution contains particles that are smaller than $1\mathit{ nm}$ in size.