Greetings: I have a question regarding moisture in LN2 Dewars. My assumption is under normal conditions, the moisture would be frozen solid and have a very low vapor pressure, but what happens to the ice as the dewar becomes empty... anyone else experienced a problem that could be attributed to moisture in a LN2 system? Thanks, Tom Ostertag [log in to unmask] [log in to unmask] [log in to unmask] Minneapolis, MN