做功和热传递可以改变物体的内能 .在日常生活中 ,我们常常可观察到热传递改变物体内能的现象 ,而做功改变物体内能的现象就不容易观察到 ,尤其是物体对外做功 ,使得物体内能减小的现象就更不容易观察到了 .但是 ,只要按照下面介绍的方法去自制一个简单的仪器 ,你就可以用它来 Performing work and heat transfer can change the internal energy of the object. In daily life, we can often observe the phenomenon of heat transfer changing the internal energy of the object, and the phenomenon of doing work to change the internal energy of the object is not easy to observe, especially the work done by the object externally. The phenomenon of reducing the internal energy of the object is even less easy to observe. However, you can use it to create a simple instrument by following the method described below.