SCIENCE QUESTION!

Solid carbon dioxide is called (dry ice) because:
-The temperature of the carbon dioxide in solid form is below 78.5 °C, that is, as cold as (ice);
-the solid carbon dioxide sublimes (from solid state direct to gas state) without becoming the liquid state (wet), and is considered to be (dry).
Thus, it is called (dry ice).

More details on (dry ice):
http://en.wikipedia.org/wiki/Dry_ice
http://zh.wikipedia.org/wiki/%E4%B9%BE%E5%86%B0

I have tried my best to help you.

2007-08-29 10:28:07 補充：
幫到你嗎?

因為carbon dioxide 係氣體，而佢變冰時係唔會好似水咁由液體再變固體。
冷卻carbon dioxide 時，係由氣體直接變成固體，所以佢溶時，係唔會變成液體的CO2，只會變成氣體的CO2 ，所以唔係濕，
that why solid carbon dioxide is called dry ice!!!!