solidification
Solidification refers to the temperature drop, the material from the liquid into a solid process, the material solidification temperature is called freezing point. At present, almost all of the known liquid can solidify into solid at low temperature. Helium is the only exception. At atmospheric pressure, it is still liquid (liquid helium) at absolute zero, and it needs to be pressurized to solidify into solid. Most of the material has the same freezing point and melting point temperature. But some of the material freezing point and melting point will be no different. For example, there is a hot hysteresis phenomenon at 80 ° C and a freezing point between 31 ° C and 40 ° C. ...