论文部分内容阅读
这里的“三点”指的是物质的熔点、凝固点和沸点。物质的熔点、凝固点和沸点代表了它们自身的某些热学特性,在实际生活中也有着广泛的应用。一、熔点和凝固点的应用晶体在熔化时温度保持不变,这时的温度叫做熔点。液体在凝固成晶体过程中温度也保持不变,这时的温度叫做凝固点。研究发现,同种物质的熔点和凝固点相同,不同物质的熔点和凝固点不同。物质的熔点并不是固定不变的,有两个因素对熔点影响很大。一是压强,平时所说的物质的熔点,通常是指一个大气压时的情况;另一个就是物质中的杂质,我们平时
Here “three points ” refers to the material’s melting point, freezing point and boiling point. The material’s melting point, freezing point and boiling point represent some of their own thermal properties and are also widely used in real life. First, the melting point and the freezing point of the application of the crystal melting temperature remains unchanged, when the temperature is called melting point. Liquid in the process of solidification into crystal temperature remains unchanged, when the temperature is called the freezing point. The study found that the same kind of material melting point and the same freezing point, different materials have different melting point and freezing point. The melting point of the material is not fixed, two factors have a great influence on the melting point. First, the pressure, usually referred to as the melting point of the material, usually refers to the case of an atmospheric pressure; the other is the impurities in the material, we usually