![]() Question: What Is the Temperature of Liquid Nitrogen? How Cold Is It? Answer: Liquid nitrogen is very cold! At normal atmospheric pressure, nitrogen is a liquid between 63 K and 77.2 K ( -346☏ and -320.44☏). Cooling materials for easier machining or fracturing. ![]() Shielding materials from oxygen exposure.Cryotherapy to remove skin abnormalities.Coolant for superconductors, vacuum pumps, and other materials and equipment.Cryopreservation of biological samples.Freezing and transport of food products.As the nitrogen evaporates, there is a risk of violent oxidation of organic matter. Liquid nitrogen containers may accumulate oxygen which is condensed from the air.Use liquid nitrogen in a well-ventilated area. Cold nitrogen gas is heavier than air, so the risk is greatest near the ground. Adding a lot of nitrogen to the air reduces the relative amount of oxygen.Do not enclose liquid nitrogen in a sealed container, as this may result in bursting or an explosion. Because it boils so rapidly, the phase transition from liquid to gas can generate a lot of pressure very quickly.Make sure exposed skin surfaces are covered and preferably insulated. Wear proper safety gear when handling liquid nitrogen to prevent contact or inhalation of extremely cold vapor. Liquid nitrogen is cold enough to cause severe frostbite upon contact with living tissue.Nitrogen gas is slightly lighter than air once it reaches room temperature.Nitrogen is non-toxic, odorless, and colorless.The liquid to gas expansion ratio of nitrogen is 1:694, which means liquid nitrogen boils to fill a volume with nitrogen gas very quickly. ![]()
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