how many helium balloons would it take to pick up a 100lb person?

This guy used about 150 giant party baloons. His weight plus the weight of his chair/parachute etc. was about 600 pounds. This site says each baloon gave four pounds of lift... but you won't find these at your grocery store... and he was lifted much higher than you will probably wish to go... Just be sure you don't violate any aviation regulations:

http://www.onlineweblibrary.com/blog/?p=623
 
The "Mythbusters" had that on a TV show. It seems that to lift about one pound of weight, about 100 toy balloons are needed. For a 100 pound person, 10,000 balloons would be needed, plus enough balloons to lift your clothes, camera and whatever harness is needed to hold the balloons.
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