Siler cools the Iris.
Liquid nitrogen is nitrogen in a liquid state at a very low temperature (<77K,<-196C). When Sokar was attacking the Iris with a Particle accelerator, MSgt. Sylvester Siler used liquid nitrogen to cool the Iris. (SG1: "Serpent's Song")
The Serrakin Ion drives use liquid nitrogen as fuel. (SG1: "Forsaken", "Space Race")
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