内能是初中物理教学的难点，欲知内能的含义、变化的途径以及如何识别内能有无变化等问题，不能孤立地谈内能，应该相应地弄清下述几个问题。１１温度 温度是热学中一个重要的基本概念，初中只讲温度是描述物体冷热程度的物理量，若仅限于这种认识，难于接受教材中所表述的内容 Internal energy is the difficulty of junior high school physics teaching. To understand the meaning of internal energy, ways to change, and how to identify internal energy changes, etc., we should not talk about internal energy in isolation. We should clarify the following issues accordingly. 11 Temperature Temperature is an important basic concept in the field of heat. The junior high school only talks about temperature as the physical quantity describing the degree of cold and heat of the object. If it is limited to this understanding, it is difficult to accept the content expressed in the textbook.