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Nitrogen gas is an industrial gas created by the fragmentary refining of fluid air, or by mechanical means utilizing vaporous air . https://bit.ly/2JtWe0S Cool Science Projects, Science Experiments, Liquid Nitrogen, Glass Of Milk, Dry Ice, Alcohol, Homemade, This Or That Questions, Canning

Real liquid nitrogen is nontoxic and vaporizes upon contact with skin. "Homemade liquid nitrogen" made from alcohol is toxic and more likely to give you frostbite.