CHEMISTRY
'(<a href="http://www.j-archive.com/media/2008-05-30_DJ_29.jpg" target="_blank">Jimmy of the Clue Crew reports from the <i>Jeopardy!</i> lab.</a>) Putting dry ice in water shows a solid transforming directly into a gas, a <a href="http://www.j-archive.com/media/2008-05-30_DJ_29a.jpg" target="_blank">process</a> called this'
sublimation