機械能熱能互變演示器用于演示熱能和機械能的互相轉變，說明克服摩擦力做功可以產生熱，消耗熱也可以做功。
J2254 Mechanical Energy Can Demonstrate Cross-Change
Mechanical energy can change each presentation is used to demonstrate the mechanical and thermal changes in each other, to overcome the friction that can arise when working heat, heat consumption can also be acting.