Silica gel is porous silica dioxide, synthetically obtained from sodium silicate. Silica gel is hard and heavy; it is stronger than common household gels, such as gelatin or agar. It is a natural mineral, which is purified and processed. Silica gel is the most prevalent gel in everyday life, most commonly used as beads in a small (1,2 x 0,79 cm) paper bag. It is used as a desiccant in this form, controlling moisture and avoiding spoilage/degradation of some goods.