what is colloidal solution class 9

A colloidal solution, also known as a colloid, is a heterogeneous mixture in which the particles of a colloid are uniformly spread throughout the solution. It contains finely divided particles (approximately 1 to 1000 millimicrons in size) dispersed within a continuous medium in such a manner that prevents them from being filtered easily or settled rapidly. Examples of colloidal solutions include milk, hair cream, toothpaste, fog, mist, smog, cheese butter, and paint. Colloidal solutions have several properties, such as being stable, not settling down when left undisturbed, having tiny particles that are not visible to the naked eye, and being able to scatter a beam of light passing through it and make its path visible. They are classified based on the physical state of the dispersed phase and dispersion medium.