为了明了关于物态变化的热平衡方程问题的实质,并使问题的解答简明起见,我们认为解题时画一些图线是适当的。对于任何一个问题通常都先画一条大致的图线,而在解决问题以后再使图线精确。这个课题的习题通常不会引起困难。但是可以举出所遇到的一些错误,而这些错误是学生预先应该防止的。例如解答热学习题时,学生可能得到固体的温度大于熔点,甚至大于沸点。如果利用图线,就可以及时避免这样的错误。让我们来举一个例子 In order to understand the essence of the problem of the heat balance equation about the change of state and make the solution of the problem simple, we think that it is appropriate to draw some graphs when solving the problem. For any one question, a rough plot is usually drawn first, and the plot is accurate after the problem is solved. Exercises on this subject usually do not cause difficulty. But you can cite some of the mistakes you have encountered, and these mistakes should be prevented by the students in advance. For example, when solving a heat problem, a student may get a solid temperature above the melting point, even above the boiling point. If you use the map, you can avoid such mistakes in a timely manner. Let us give an example