Sun, HP "scrap" (???)

On 1 Jun 2007 at 16:53, woodelf wrote: Maybe you can see a hydrogen flame because you've got vision into the UV. But a hydrogen flame is very difficult to see in normal illumination (and just about impossible under daylight conditions) for mere humans. See, for instance: http://www.humboldt.edu/~serc/h2safety.html I remember from my misspent college summers working as an instrumentation tech at a steel mill that one needed a special detector to see a hydrogen flame. Those of us who worked at the hydrogen-generating plant were warned about this. Hydrogen in quantity is nasty stuff--we had to check our toolbelts, matches, cigarette lighters and any steel pocket contents at the gate, lest we would cuase a spark and ignite the stuff (the range of explosive mixtures of H2 and O2 is very wide). I learned how blunt a sparkproof screwdriver could get in no time at all. Cheers, Chuck