00:00Liquid hydrogen flashes instantly into boiling gas at minus 253 degrees.
00:06Engineers pump this super-chilled liquid through double-walled metal pipes built with a complete vacuum space.
00:12Heat usually travels by touching things or floating through the air inside standard insulation layers.
00:19Removing all air from between the metal walls strips away gas molecules that carry thermal energy.
00:26Special reflective foil wraps the inner tube to block radiant heat from creeping across the gap.
00:32This near-total vacuum prevents thermal transfer, delivering liquid hydrogen safely to rocket engines.
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