Feature 1It's a ring-shaped and twisted glass toy with a liquid in it that boils when heat is transferred from your bare hands. 2It proves the vapour-liquid equilibrium, the colored liquid in the container is a volatile mixture with a boiling point just above room temperature. 3Boil this liquid at your body temperature, hold the lower container with your hand, and observe how the liquid boils and rises through the tube to the upper container. 4Once leave your hand, it takes a few minutes for the liquid to cool and return to the container below, which is a very interesting science toy and a great demonstration of energy transfer. 5The heat on your hand causes the liquid to boil, causing the liquid to evaporate into a gas. The expanding gas pushes the liquid upward, and when you release your hand, the equilibrium is re-established. The gas condenses again into a liquid and flows back to the container below.SpecificationCondition: Item Type: Thermometer ToyMaterial: High Borosilicate GlassProduct Size: Approx. 16 x 5 cm / 6.3 x 2 inWeight: Approx. 63g / 2.2oz .wang-edit-text{ font-family:'Arial' !important } .wang-edit-text table { border-top: 1px solid 000 border-left: 1px solid 000 } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000 border-right: 1px solid 000 padding: 3px 5px } .wang-edit-text table th { text-align: center }Package List1 x Thermometer ToyNote1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.