A piston placed in the open end of a horizontal test tube which has its other end partially filled with steel wool may oscillate when the closed end is heated up. Investigate the phenomenon and determine the efficiency of this engine.
将一个封闭端用钢丝球填充的试管水平放置,在试管的开口端安装一活塞,当封闭端被加热时,活塞可能发生振动。研究该现象并确定该发动机的效率。