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Why SpaceX Chills Falcon 9's Oxygen Almost to Freezing

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SpaceX chills Falcon 9's liquid oxygen to about -340°F (-207°C), much closer to its freezing point of about -362°F (-219°C) than its boiling point of about -297°F (-183°C). Colder oxygen is denser, so more propellant fits in the same tank. The RP-1 kerosene is chilled too, to about 20°F (-7°C), which raises its density by about 2.5-4%. The turbopumps can then push more propellant mass through the upgraded Merlin engines for more thrust. The catch: the propellant warms quickly once loaded, so SpaceX fills the rocket late in the countdown. The cold also brought a risk. After AMOS-6 was lost during fueling in 2016, the investigation found oxygen could pool in buckles in the liner of a helium bottle inside the oxygen tank, freeze solid, and potentially ignite through friction. SpaceX's Hans Koenigsmann put the gain from densification alone at about 5-6%. Sources: https://en.wikipedia.org/wiki/Falcon_9_Full_Thrust https://en.wikipedia.org/wiki/RP-1 https://en.wikipedia.org/wiki/Liquid_oxygen https://arstechnica.com/science/2016/04/spacex-says-cargo-launch-ready-hopes-to-nail-the-landing-this-time/ https://spaceflightnow.com/2017/01/06/engine-hotfire-test-completed-for-spacexs-first-launch-since-explosion/ https://www.spacex.com/launches/crs35 #SpaceX #Falcon9 #rocket #engineering #science #shorts #Shorts

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