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Why rockets need the gas in party balloons
HERE’S THE INTERESTING PART
The exact same gas you use to fill cheap birthday balloons is critical to launching billion-dollar payloads into the void. As liquid propellant is consumed by the ravenous engines, empty space forms inside the tanks, threatening to collapse the structural integrity. Pumping in inert helium fills the void perfectly without risking an accidental, catastrophic chemical explosion.
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