A homogenous mixture is uniform and thus hard to recognize as a mixture. An example is water.
3.71 × 10^9 cubic millimeters
Sublimation takes place when an element or compound changes directly from a solid into a gas without passing through the liquid state....
this is what i found i do not know much about dry ice but i hope this helps you!!!
http://askville.amazon.com/ice-unused-freezer-shrink-time/AnswerViewer.do?requestId=2377877
this is the website i found this little information from i hope this helps you out