Expansion ratio
The expansion ratio of a liquefied and cryogenic substance is the volume of a given amount of that substance in liquid form compared to the volume of the same amount of substance in gaseous form, at room temperature and normal atmospheric pressure.[1]
If a sufficient amount of liquid is vaporized within a closed container, it produces pressures that can rupture the pressure vessel. Hence the use of pressure relief valves and vent valves.[2]
The expansion ratio of liquefied and cryogenic from the boiling point to ambient is:
- nitrogen 1 to 696
- liquid helium 1 to 757
- argon 1 to 847
- liquid hydrogen 1 to 851
- liquid oxygen 1 to 860
- Neon has the highest expansion ratio with 1 to 1438.[3][4]