Educational physics demonstration apparatus for middle school use, designed to illustrate the structure and working principle of a simple machine. Key benefits Clear, handson demonstration of machine structure and principles for classroom teaching and lab exercises. Selfcontained setup keeps all components fixed to a single base for stable, repeatable demonstrations. Compact footprint fits standard classroom and lab benches, supporting easier setup and storage. Main features Configured with a small cylinder, a large cylinder, and a pressure gauge or an angle cutting valve to show how the components interact. All components are fixed to the base and interconnected by conduit for straightforward, visible flow and pressure connections. Fuel tank fixed inside the base to provide an integrated, neat installation. Size: 270 x 165 x 335 mm, designed to improve conversion rates during demonstrations. Function and compatibility Designed specifically for middle school physics experiments and compatible with typical classroom teaching aids and lab setups. Functions as a visual and practical model to demonstrate relationships between cylinder size, pressure, and mechanical output. Works with standard classroom procedures for observing component interaction and basic machine principles. Performance and practical attributes Fixedcomponent layout reduces setup time and minimizes misalignment during demonstrations. The inclusion of a pressure gauge or angle cutting valve allows teachers to demonstrate control of flow and pressure in real time. Compact dimensions allow use on a variety of work surfaces without requiring additional support equipment. Use scenarios Classroom demonstration: Teacher shows how different cylinder sizes affect force transmission and mechanical advantage during a live lesson. Lab exercise: Students record pressure readings while changing valve settings to observe and discuss cause and effect. Practical demonstration of energy conversion: Use the apparatus to illustrate how fuel input and pressure changes translate into mechanical action for basic efficiency discussions. Specifications Intended application: Middle school physics experiments to illustrate machine structure and principle. Components: Small cylinder, large cylinder, pressure gauge or angle cutting valve, conduit connections, fuel tank. Mounting: All components fixed to base. Dimensions: 270 x 165 x 335 mm. This apparatus provides a straightforward, classroomready way to demonstrate core mechanical and pressure principles without complex assembly.