Chemical Properties:
A nitrous oxide molecule is made up of 2 atoms of nitrogen and 1 atom of oxygen. By weight it is 36% oxygen (air is only 23.6% oxygen). At 70° F it takes 760 PSI of vapour pressure to hold nitrous in liquid form. The critical temperature is 97.7° F; at this temp the vapour pressure can no longer hold the nitrous in liquid form. At this point the nitrous turns gaseous and will be at 1069 PSI. As temperature rises further, so will pressure, but it will remain in gaseous form. If you intend to siphon liquid nitrous, it is important to keep the temperature below 97.7°. When liquid nitrous is released, it will go from 760 PSI to 14.7 PSI (normal atmospheric pressure). It will then begin to boil and rapidly expand; the pressure drop will cause the temperature to decrease. Nitrous boils at 129.1°F below zero.
