The key to making instant snow is knowing how it forms. In this activity a compound called a polymer interacts with water resulting in an increase in volume of the solid polymer. An increase in volume of 50 – 100x is observed. Polymers are formed by chemical reactions of monomers (small molecules) joining together sequentially to form long chains called polymers. An analogy to the formation of polymers is how beads can be strung together to form a bracelet. Polymers are all around us; a great example is rubber.