Clearly, the usual method of putting it on weighing scales won't work on earth because the balloon would float. I also don't think you could put it in a vacuum as, while the balloon wouldn't float, the vacuum would cause the balloon to expand and burst. (I think)
If there are a number of methods, which would be most accurate?
A few conditions
- You can't weigh a deflated balloon and assume the mass of the helium is negligible.
- No theoretical calculations of mass from data book values like density and atomic mass.
