Definition of Colloid

Colloid is basically a mixture in which a substance is mixed or scattered evenly throughout another substance. It is one of the three major types of mixtures. The two others are solutions and suspensions. The three kinds of mixtures are distinguished by the size of the particles that make them up. The colloid's particles are in range of sizes, they are around 1 and 100 nanometers. For solution's particle's size, they are around 1 nanometer (about the size of a molecules) and for the size of suspension's particle, they are bigger than 100 nanometer.