Liquid Nitrogen Fact Sheet At normal pressure (like the pressure of the room you’re sitting in now), liquid nitrogen boils at 77 K (or −320.4°F). That is why it looks like steaming, boiling water when it is poured – because it IS boiling! Liquid nitrogen is made by condensing air until it becomes a liquid. Nitrogen makes up 78% of the air you breathe. Nitrogen is non-toxic, odorless, colorless and non-flammable. The chemical symbol for nitrogen liquid and gas is N2 (which is why we call it N2ice Cream (with a silent 2 of course))! Your body is 3% nitrogen by weight and you eat it in many common foods. Liquid nitrogen weighs 6.745 pounds/gallon The container that holds liquid nitrogen is called a dewar. Different sizes and shapes of dewars