什麼是昇華?
THX(^_^)
什麼是昇華?
2007-10-31 12:23 am
回答 (2)
2007-10-31 12:31 am
✔ 最佳答案
昇華是指一种物质从固态不经过液态直接转化为气态的过程，是物质在温度和气压低于三相点的时候发生的一种物态变化。与昇華相反的过程称做凝華，指物质从气态直接变成固态。這樣的例子有結霜。
昇華是吸熱的反應，所需的熵是汽化熱和熔化热之和。
[编辑] 例
砷在高溫可以昇華。鋅和鎘在低壓下可昇華。
氯化氨、固體二氧化碳（乾冰）、碘、萘、無水三氯化鐵和無水三氯化鋁等都可以昇華。
**昇華即係由固體直接轉為氣體, 例子係乾冰
參考: wikipedia, me
2007-10-31 9:32 am
昇華Sublimation
is a change of state from solid to gas or gas to solid directly.
Examples of substance that can sublime at normal pressure and temperature are
1. Dry ice (carbon dioxide) and
2. Iodine
is a change of state from solid to gas or gas to solid directly.
Examples of substance that can sublime at normal pressure and temperature are
1. Dry ice (carbon dioxide) and
2. Iodine
收錄日期: 2021-04-13 14:15:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071030000051KK01805