A compact demonstration device that makes heat transfer and vapor expansion visible and easy to explain. The looped twisted glass tube contains a colored volatile liquid that rises and falls as heat converts liquid to gas and back, providing a clear visual of equilibrium shifts and energy transfer. Key benefits Teaches core physics and chemistry concepts without complex equipment: shows evaporation, gas expansion, and pressuredriven liquid movement. Immediate, handson feedback: responds to body heat so users can trigger the effect by holding the glass, which makes demonstrations intuitive and memorable. Visual and engaging: colored liquid and continuous motion capture attention for classroom demonstrations, science fairs, or desktop exploration. Product features Function: heatdriven liquidtogas transition pushes liquid upward and allows it to fall as gas cools, illustrating dynamic equilibrium and volatile mixture behavior at room temperature. Design: looped, twisted glass tube that amplifies visual motion and creates a continuous, easytoobserve cycle. Material: clear glass tubing with colored liquid fill for visibility. Performance: reacts to small temperature changes; hand heat is sufficient to initiate the boilinglike motion. Compatibility: suitable for classroom demonstrations, handson learning activities, and tabletop displays. Practical applications Classroom demonstration: use during lessons on thermodynamics, phase changes, vapor pressure, or equilibrium to give students a clear, repeatable visual example. Science fair or presentation prop: perform controlled demonstrations to illustrate how temperature influences gas volume and liquid movement. Desk exhibit or teaching aid: keep on a desk to prompt questions, reinforce concepts during informal teaching moments, or serve as a conversation piece in educational settings. How it helps Simplifies abstract concepts by turning them into observable behavior, helping learners connect theory to realworld phenomena. Reduces preparation time for demonstrations since no external heat source or pumps are required; demonstrations are repeatable and easy to control by hand. Supports multiple learning styles by combining visual, tactile, and verbal explanation. What to expect A looped twisted glass device filled with a colored liquid that visibly moves when warmed. Reliable, repeatable motion triggered by small temperature changes such as hand warmth. Clear, immediate illustration of energy transfer and equilibrium shifts without additional equipment. Note Handle glass with care. Use on a stable surface for demonstrations and storage.