A mixed combination in which the solute particles are larger than the molecules or ions, but cannot be seen with the naked eye, is called a colloidal solution. A familiar mixture of two substances, one of which, called the disperse phase, is regularly destroyed, the other being in a remarkably divided state by the second substance, called the dispersion phase. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay The dispersion phase can be a gas, a liquid or a solid and the dispersed phase can also be any of them, excluding a gas in another. A system of colloidal particles dispersed in a gas is called an aerosol. A colloid with water in the dispersed phase is called a hydrosol. There is no strict line of differentiation between true solutions and colloidal systems or between simple hold-ups and colloidal systems. When the particles of the dispersed phase have a diameter less than approximately 10-3 µm, the system begins to assume the advantages of a true solution; when the dispersed particles are much larger than 1 µm, the departure of the dispersed phase from the dispersing phase becomes so rapid that it is best to consider the system as a suspension. According to this last criterion, natural clouds present in the atmosphere should not be classified as aerosols; However, because many cloud forms apparently exhibit the characteristics of true colloidal suspensions, this strict physicochemical definition is often ignored in determining a timely and useful analogy. Condensation nuclei and many unnatural fumes can be considered aerosols. The dispersion phase can be a gas, a liquid or a solid. Smoke is composed of a solid dispersed in a gas. Milk is a liquid dispersed in a liquid. Pumice is a gas dispersed in solids. There are two forms of colloidal systems. Sol: A system composed of an inviscid colloidal solution is called sol. For example milk.Gel: A system composed of a viscous colloidal solution is called gel. For example, on the other hand. The colloidal system can be characterized into two general classes on the basis of their empathy for liquids: Lyophilic system: The system in which the dispersed phase and the liquid dispersion phase attract each other is called lyophilic system. Lyophobic system: The system in which the dispersed phase and the liquid dispersion phase repel each other is called lyophobic system. Types of colloidal dispersions: The dispersed phase and the dispersion phase can be solid, liquid or gaseous. Depending on the state of the dispersed phase and the dispersion phase, eight different types of colloidal dispersions can exist. Eight different types of colloidal dispersions are: foam; solid foam; liquid ; aerosol emulsions; gels; solid ; aerosol; ground ; solid ground. It is important to note that when a gas is mixed with another gas, a similar mixture is formed, that is, the gases are completely miscible with each other. Colloidal dispersions are varied in nature and gas dispersed in another gas phase does not form a colloidal system. When the dispersion phase is gaseous, the solution is called aerosol and when the dispersion phase is liquid, the colloidal dispersion is called Sol. Soils can further be classified into different types based on the liquid used. If the liquid used is water, the solution is hydrosol or aquasol. If the liquid used is benzene, the solution is called benzosol. If the liquid used is alcohol, the solution is alcohol. If an organic compound is :.