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物质三态间的变化可分为两个方向.其一为下降方向,即气→液、液→固和气→固.物态变化名称分别为液化、凝固和凝华,其特征是要放出热量.其二为上升方向,即固→液、液→气和固→气,物态变化名称分别为熔化、汽化和升华,其特征是要吸收热量.解题时首先要抓住概念,其次要注意分析变化的过程,才能对号入座.
The three-state change of matter can be divided into two directions. One is the direction of decline, that is, gas→liquid and liquid→solid and gas→solid. The names of the change of state of matter are liquefaction, solidification and desublimation, respectively. Its characteristic is to release heat. The second is ascending direction, namely solid→liquid and liquid→gas and solid→gas. The names of the change of state are melting, vaporization and sublimation respectively. Its characteristic is to absorb heat. The first thing to do when solving a problem is to grasp the concept, and the second is to Pay attention to the process of analysis of changes before you can enter the seat.