在理想气体与机械运动综合问题中 ,由于机械运动的状态及其变化决定于受力情况 ,而气体的状态及其变化与压强 (压力 )密切相关 ,所以 ,气体的压强 (压力 )通常成为沟通气体状态与机械运动的桥梁 .把握住这一关键 ,并善于从局部或整体选择相关的研究对象 ,寻找已知量与待求量关 In the problem of ideal gas and mechanical motion synthesis, because the state of the mechanical movement and its change are determined by the force conditions, and the state and changes of the gas are closely related to the pressure (pressure), the pressure (pressure) of the gas usually becomes communication. The bridge between gas state and mechanical movement. Grasp this key and be good at selecting related research objects from local or whole, looking for known quantity and required quantity.