This is the blog of Bovine Aerospace, a club devoted to launching balloons for high altitude photography and long distance travel.
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Bovine Aerospace 
I am a student at the University of North Florida and we are launching a balloon/payload with hydrogen. Did you use your entire 200 cft tank? If not, how much would you guess you used?
Thanks for your help!
Hey Eric, I’m not sure how much we used. My latest launch (one that is still MIA) didn’t use enough hydrogen, and it barely got off the ground. It also did not pop and ended flying for 12 hours. This is not something you want to have happen to you, so I strongly advise you to err on the side of putting more in. Worst case is it pops a few thousand feet lower than it would have otherwise.