物质由固态变为液态称为熔化,在这个过程中物质要吸热,物质由液态变为固态称为凝固,在这个过程中物质要放热,这是两个互为逆反的过程,固体分为晶体(常见晶体有海波、冰、石英、水晶、食盐、萘、明矾、各种金属等)和非晶体(常见非晶体有松香、玻璃、蜡、沥青、橡胶等),它们在熔化和凝固过程中遵循不 Material from the solid into a liquid known as melting, in the process of absorbing heat, the material from the liquid into a solid called solidification, in the process of material to be exothermic, which is the reverse of each other two processes, the solid content For the crystals (common crystals are sea waves, ice, quartz, crystal, salt, naphthalene, alum, all kinds of metals, etc.) and non-crystalline No follow during solidification