gearhead searching for horsepower needs help from science. please read

[mcat]

nitrous oxide..NO2

automotive is NO2S sulfer is added.

i need to find a way to get nitrous oxide that is at 32*f to maintain 950 psi in a tank with a siphon tube.

at 32* NO2 is at roughly 460psi.

when used in racing, the nitrous is heated to arounf 92* to acheive 950ish psi.

i need a non flamable solution and somthing that wont hurt the NO2 properties.

my theory is colder nitriuos=smaller molicules

smaller means more in a certain size space.

more is good

thank you for reading

i hope i made it clear enough..

also the 950 psi could be in a 2nd pusher type bottle if needed