第一节热是由物质的运动产生的凡是用锯子锯过木头的人一定知道在锯木头时锯子会变得很热;越锯得快据子就越热。因此我们知道热可以由锯子的运动产生,而且锯子和木头摩擦得越快产生的热量就越多。热和运动有着极密切的联系。在日常生活中我们可以遇到许许多多因运动而产生热的例子。例如在创床上创东西时创子会发热, The first quarter of heat is produced by the movement of matter. Everyone who saws wood with a saw must know that the saw will become very hot when sawing the wood; the sooner it is saw, the hotter it will be. So we know that heat can be generated by the movement of the saw, and the faster the saw and the wood are rubbed, the more heat there will be. Heat and sports have a very close relationship. In everyday life we ​​can encounter many examples of heat generated by exercise. For example, when creating something in a creator bed, the creator will have fever,