Milk is a colloidal solution that appears to be homogeneous but actually is heterogeneous.
Properties of colloids
- Colloids are mixtures whose particles are larger than the size of a molecule but smaller than particles that can be seen with the naked eye.
- Colloids are common in everyday life. Some examples include whipped cream, mayonnaise, milk, butter, gelatin, jelly, muddy water, plaster, coloured glass, and paper.
- Colloids can be made from almost any combination of gas, liquid, and solid.
- The particles of which the colloid is made are called the dispersed material.
- Any colloid consisting of a solid dispersed in a gas is called a smoke. A liquid dispersed in a gas is referred to as a fog.
- Every colloid consists of two parts: colloidal particles and the dispersing medium.
- The dispersing medium is the substance in which the colloidal particles are distributed. Colloids also exhibit Brownian movement. Brownian movement is the random zigzag motion of particles that can be seen under a microscope