昇華的相反？

Deposition is a process in which gas transforms into solid. The reverse of deposition is sublimation (昇華).

One example of deposition is the process by which, in sub-freezing air, water vapor changes directly to ice without first becoming a liquid. This is how snow forms in clouds, as well as frost and hoar frost on the ground.

Another example of physical deposition is the artificial process of physical vapor deposition, used to deposit thin films of various materials onto various surfaces.

Deposition: 沈積作用,沈積物

液態變氣態叫做蒸發，氣態變液態叫做凝結
固態變液態叫做熔解，液態變固態叫做凝固
所以你「以為」昇華有相反！
固態直接和氣態之間的轉化[不須經過液態]便叫做昇華，即是話不論固體直接變氣體還是氣體直接變固體都叫做昇華。

2007-03-06 13:44:45 補充：
對不起！我錯了。