SCIENCE GIZMOS: Expanding Spheres
These 3.3mm diameter gel like spheres will expand to 20mm diameter. Over 6x its original size. Super absorbent polymers absorb large volumes of water when placed in water and are turned into hydrogels. The volume change can be an incredible 250x of the original volume and is fully reversible. The gelled polymer contains up to 98% water so it has the same optical density as water and becomes invisible in water. Can be coloured by added food dye.
Scientific Gizmos are fun and easy to use to demonstrate the properties, mechanics and applications used and taught in Physics and Chemistry labs. (NOTE: Brand may vary from image displayed).