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贮存液氧和液氮技术的研究要比液氢和液氦技术的研究早得多,后者是在近二十年来开展起来的。由于沸点低,蒸发潜热小,液氢和液氦技术就更为复杂。为液氢液氦的高要求所拟定的一套较好的处理程序可以应用于所有的低温液体。表Ⅰ列出了当沸点温度降低时单位体积的蒸发热减少的情况。还列出了在一个大气压下把蒸汽从饱和温度加热到540°R所需的显热。
The study of the technique of storing liquid oxygen and liquid nitrogen is much earlier than the study of liquid hydrogen and liquid helium, which was developed in the last two decades. Due to their low boiling point and low latent heat of vaporization, liquid hydrogen and liquid helium technologies are even more complicated. A good set of procedures developed for the high demands of liquid hydrogen helium can be applied to all cryogenic liquids. Table I shows the reduction of the heat of vaporization per unit volume as the boiling temperature decreases. Also listed are the sensible heat needed to heat the steam from the saturation temperature to 540 ° R at one atmosphere.