When two distinct substances are mixed up together thus they can mix intimately and produced two-component systems. While one component is uniformly distributed throughout the second component, the first component is known as the dispersed phase and the second is a continuous phase. It may be in the liquid, solid, or gas.
Often, a solid substance in the pharmacy dispersed in a liquid, generally in the water, and the product might have characteristics of a molecular dispersion. A colloidal dispersion based on the particle size of the dispersed solid. True solutions contain particle ions or small molecules in which the particle size is less than the 1 nm. Particle particles in colloidal dispersion are either large molecules of high molecular weight or are the sum of small molecules with 1 nm and 500 nm in size. In particle dispersion, the particle diameter is more than 500 nm. The colloids are classified as hydrophilic colloid and hydrophilic colloid.
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