We all saw our parents and grandparents separating rice grains from small stones or pebbles, pulses, filtering tea leaves before serving tea, and much more. Separation of substances usually requires the practice of removing or separating the required substances from their mixtures. A substance can be classified into: the pure substance and the mixture.
The things we all use in our daily lives are composed of different material types. All of these materials have mass, shape and are classified according to many criteria including their physical state, material properties, etc.