Hello, I'm with a group called RINO (would give you a webiste, but don't have one yet). In Holland we go to schools to do shows with liquid nitrogen. At the moment we're trying to improve our show, so we're thinking about new experiments. I was hoping some of you might have a great suggestion. Right now we're doing several things, - change of sound when something is cooled down, - what happens to fruits when they are cooled down (they become hard, some can shatter ) -make small explosive sounds when you put some water in a cup with LN2 -things shrink when they are coold down -and as a new experiment we can create small amounts of liquid oxygen :tongue: and use that to relight a match that has gone out but still glows. Thanks in advance for any suggestions, Gijs. whoops, this might just be more of a general physics subject.