Thanks Mapes,
I don't know what pressures he tested at but your response is in line with my first thoughts on the issue. My guess is that his tests were at low (a few atmospheres) levels. I will "pressure" him into giving more details.
A friend has asked a question of me that has me wishing that my days of thermodynamics were not so long in the past. He and some colleagues have been making electrolytic cells for high production of hydrogen and oxygen from water. In demonstrating one to me he posed an experiment that on the...