Product overview This demonstrator shows how compressing and expanding air changes internal energy and temperature. It makes two fundamental thermodynamic processes easy to observe: heating during compression and cooling during rapid expansion. Key benefits Clear demonstration of core principles: Shows that doing work on a gas raises its internal energy and temperature, while allowing a gas to expand to do work lowers its internal energy and temperature. Visual and audible feedback: Compression produces a measurable temperature rise and gradual heat transfer to the surroundings; rapid release of the compressed air ejects a rubber plug with an audible pop and causes a sudden temperature drop. Effective teaching tool: Makes abstract thermodynamic concepts tangible for students and trainees, improving understanding of energy conversion and heat transfer. Main functions and components Cylinder and piston arrangement for controlled air compression. Rubber plug that is expelled when internal pressure exceeds a threshold, enabling sudden expansion. Demonstrates the sequence: compress air, observe temperature increase and heat loss, trigger rapid expansion, observe temperature decrease and hear the pop. Performance and behavior Compression raises the gas temperature as external work is done on the gas. Heat produced during compression transfers gradually to the surrounding environment. Sudden release of the plug produces rapid expansion, a clear pop sound, and a sharp temperature drop in the gas. Compatibility and use Designed for classroom demonstrations, laboratory exercises, and instructorled experiments in physics, engineering, and vocational training settings. Suitable for illustrating thermodynamic concepts alongside temperature measurement devices and pressure gauges. Typical applications Classroom lecture demonstrations to illustrate the relationship between work, internal energy, and temperature. Laboratory exercises where students measure temperature and pressure changes during compression and expansion. Training sessions for technical or engineering programs that cover basic gas laws and energy conversion. Why choose this demonstrator Provides a straightforward, observable way to teach and learn important thermodynamic phenomena. Combines visual, tactile, and audible signals to reinforce learning. Simple setup and repeatable operation for routine instructional use.