When you open the refrigerator, a chill will fly out. Every summer, this feeling is more obvious, which is inseparable from the changes in the state of the refrigerator. The chill in the refrigerator is caused by a large number of gaseous "heat movers" absorbing heat during gasification. Be sure to spit out what you inhale. Outside the refrigerator, under pressure, these hardworking porters liquefy here and release the stored heat so as to continue their work in the next round.
Of course, in the freezer, there will be solidification. If you take the items in the freezer to the freezer, they will also melt, but they are all secondary. What is even less important is the sublimation and sublimation that will happen anywhere, needless to say.
A small refrigerator has six state changes, not to mention exquisite and natural.