Theexpansion ratio of aliquefied andcryogenic substance is thevolume of a given amount of that substance inliquid form compared to the volume of the same amount of substance ingaseous form, at room temperature and normalatmospheric pressure.[1]
If a sufficient amount of liquid isvaporized within a closed container, it produces pressures that can rupture thepressure vessel. Hence the use ofpressure relief valves and vent valves are important.[2]
The expansion ratio ofliquefied andcryogenic from theboiling point to ambient is:
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