It is needless to say that the flask must be kept upright during transporting. Remember that the increase in volume from liquid to gas approaches a factor of 700 Safety . Because of the low temperature of liquefied atmospheric gases the liquid or even vapour or gas can produce damage to the skin similar to heat burns. Unprotected parts of the skin coming in contact with uninsulated items of cold equipment may also stick to them and the flesh may be torn on removal. Cold vapours or gases from liquefied atmospheric gases may cause frostbite given prolonged or severe exposure of unprotected parts.
Frozen tissues are painless and appear waxy, with a pale yellowish colour.
Thawing of the frozen tissue can cause intense pain. Shock may also occur. The immediate treatment is to loosen any clothing that may restrict blood circulation and seek immediate hospital attention for all but the most superficial injuries. Do not apply direct heat to the affected parts, but if possible place in lukewarm water. Sterile dry dressing should be used to protect damaged tissues from infection or further injury, but they should not be allowed to restrict the blood circulation.