Q:为什么晶体有固定的熔点而非晶体没有,我看到一般书上只写到,因为晶体是长程有序的,而非晶体是长程无序而短程有序,求更深理解,为什么长程有序就有固定熔点?A:这个可以说得很形象。融化的本质就是热力学涨落,也就是分子的随机运动剧烈到可以克服分子间的吸引相互作用,使分子从束缚的状态挣脱开来,从而使得原有的固体结构被破坏。 Q: Why does a crystal have a fixed melting point and not a crystal? I just read the general book because the crystal is long-range and orderly, while the non-crystal is long-range disorder and short-range order, seeking a deeper understanding of why the long-range Order there is a fixed melting point? A: This can be very vivid. The essence of melting is the thermodynamic fluctuations, that is, the stochastic movement of molecules can overcome the attractive interaction between molecules and break away the molecules from the bound state, so that the original solid structure is destroyed.