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Flying around the world in the jet stream for ninety cents of hydrogen gas..
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MadTux:
Pure hydrogen is non flamable and burns quite unimpressively in air.
Only gets dangerous when mixed with oxygen.
But that won't happen in party ballons, because hydrogen leaks out far more quickly than the oxygen leaks into it, due to size of molecules and difference in pressure.

Using helium for balloons is a waste of helium, as stated above. But still only a very small % of the total amount of helium wasted into the atmosphere. Deep divers, rocket pressurization, venting cryogenic coolers without recovery, fancy TIG welding.... wastes a huge lot more of it. Until the helium from natural gas is depleted, than weight by weight, helium might become as expensivve as as gold  |O
NiHaoMike:

--- Quote from: MadTux on March 19, 2020, 10:34:30 pm ---Pure hydrogen is non flamable and burns quite unimpressively in air.
Only gets dangerous when mixed with oxygen.

--- End quote ---
Video demonstration:

Reminds me of the time in high school chemistry class when one of the class assignments was to build a small rocket fueled by hydrogen and oxygen, find the optimum mix of the two, then launch it.
james_s:

--- Quote from: MadTux on March 19, 2020, 10:34:30 pm ---Pure hydrogen is non flamable and burns quite unimpressively in air.
Only gets dangerous when mixed with oxygen.
But that won't happen in party ballons, because hydrogen leaks out far more quickly than the oxygen leaks into it, due to size of molecules and difference in pressure.

Using helium for balloons is a waste of helium, as stated above. But still only a very small % of the total amount of helium wasted into the atmosphere. Deep divers, rocket pressurization, venting cryogenic coolers without recovery, fancy TIG welding.... wastes a huge lot more of it. Until the helium from natural gas is depleted, than weight by weight, helium might become as expensivve as as gold  |O

--- End quote ---

The problem is mixing with air is precisely what it does as soon as the balloon pops due to proximity to an ignition source. I have filled balloons with hydrogen and ignited them many times, it's not nearly as impressive as filling them with hydrogen and pure oxygen but it creates quite a fireball none the less. This is why I say use them outdoors.
vk6zgo:

--- Quote from: MadTux on March 19, 2020, 10:34:30 pm ---Pure hydrogen is non flamable and burns quite unimpressively in air.
Only gets dangerous when mixed with oxygen.
But that won't happen in ---party ballons, because hydrogen leaks out far more quickly than the oxygen leaks into it, due to size of molecules and difference in pressure.

Using helium for balloons is a waste of helium, as stated above. But still only a very small % of the total amount of helium wasted into the atmosphere. Deep divers, rocket pressurization, venting cryogenic coolers without recovery, fancy TIG welding.... wastes a huge lot more of it. Until the helium from natural gas is depleted, than weight by weight, helium might become as expensivve as as gold  |O

--- End quote ---

Seeing how great the mass of only a small bar of gold is, (Hollywood notwithstanding), that is a lot of helium on a weight for weignt basis.
ANTALIFE:
Far out that is some cool stuff
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