I am looking for some information about how high a vacuum is needed to boil 100% ortho phosphoric acid at room temperature. I know from my own experience that it does not boil at 90C at 1e-3 mbar but someone asked me it they could increase the vacuum to 1e-6 mbar at room temp and still not have acid moving around. Thanks in advance for help with this weird question. If I don't hear anything I guess I will just have to experiment! Jason Jason Curtis, Ph.D. Stable Isotope Mass Spec Lab manager Associate-In Geochemistry Department of Geological Sciences 241 Williamson Hall University of Florida Gainesville, FL 32611 [log in to unmask], office 352-392-2296 lab 352-392-3344, fax 352-392-9294