物态变化是物质从一种状态变成另一种状态的现象，是中考的重要考点。对这部分内容的学习，同学们常出现概念混淆、吸放热过程不清、实际生活与物态变化中的具体概念联系不上等问题。解决这类问题的关键是：１弄清物态变化的六个概念知道物质由固→液、液→气、固→气这三个? Change in state of matter is a phenomenon in which matter is changed from one state to another. It is an important test point for the Chinese exam. For the study of this part of the content, the students often have problems such as the confusion of concept, unclear process of absorption and extinction, and the inability of concrete concepts in the relationship between real life and physical state changes. The key to solving this type of problem is: 1. To find out the six concepts of change in the state of matter, to know that the material consists of solid → liquid, liquid → gas, solid → gas.