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Soak hands or feet in warm water â 99 to 108 F (37 to 42 C) â for 15 to 30 minutes. If a thermometer isn't available, test the water by placing an uninjured hand or elbow in it â it should feel very warm â not hot. Don't rewarm frostbitten skin with direct heat, such as a stove, heat lamp, fireplace or heating pad.
Answer Wiki. It is safe thanks to Leidenfrost effect. As soon as the liquid nitrogen touches your skin, part of it evaporates as its boiling point is -196Â°C (-320Â°F). Gaseous nitrogen is not good heat conductor and so it will not conduct heat from your body very well. But even though it is not advised to put your hands in it.