Heat-Activated Liquid Boiling: Experience the fascinating effect of boiling liquid as your body temperature causes the liquid to rise through the tubes into the upper container. A perfect desk ornament or cool stuff for bedrooms Intriguing Science Toy: This twisted glass toy holds liquid that "boils" with the heat from your hand, providing a fun and educational display of energy transfer. Ideal for adding curiosity to your bedroom or desk Cooling Effect Demonstration: After releasing the toy, watch the liquid slowly cool and return to the large bulb, showing an exciting example of heat transfer. Great for cool bedroom décor or desk ornaments Proving Vapor-Liquid Equilibrium: This science toy demonstrates the vapor-liquid equilibrium with a volatile liquid that has a boiling point just above room temperature. An engaging addition to your bedroom or workspace Energy Transfer in Action: As your hand heats the liquid, it evaporates into gas, pushing the liquid upwards. When released, the liquid condenses and returns to the lower bulb, offering a hands-on display of science for any desk or bedroom