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自然界的物质都是以固态、液态或气态任一方式存在的．在一定条件下，它们之间可以相互转化，这种状态间的转化叫物态变化．当物质发生物态变化时，会有不同的现象发生，人们正是掌握了这一客观规律，使它在科学技术和日常生活中有着广泛的应用．现举例如下．１．焊接．焊接有
Natural substances exist in any form of solid, liquid or gaseous. Under certain conditions, they can be transformed into each other. The transformation between these states is called change of state of matter. When the physical state of matter changes, there will be different phenomena. People just grasp this objective law and make it widely used in science and technology and daily life. The example is as follows. 1. welding. Welded