Only try with your parents supervision! Make your own cloud indoors or outdoors! It’s fun and easy to make the giant liquid nitrogen cloud. I poured different amounts of liquid nitrogen into a container and then dumped hot boiling water into it! The result and cloud was instant! The hot water instantly vaporizes the -321 degree liquid nitrogen and turns it into a vapor or the cloud which you see! 🙂 Liquid nitrogen is a clear colorless liquid form of nitrogen. It is EXTREMELY cold at -321 degrees F. Nitrogen was first liquefied at the Jagiellonian University on 15 April 1883 by Polish physicists, Zygmunt Wróblewski and Karol Olszewski. It is produced industrially by fractional distillation of liquid air. Liquid nitrogen is often referred to by the abbreviation, LN2 or “LIN” or “LN” and has the UN number 1977. Because of its extremely low temperature, careless handling of liquid nitrogen and any objects cooled by it may result in cold burns. In that case, special gloves should be used while handling. However, a small splash or even pouring down skin will not burn immediately, because the evaporating gas thermally insulates to some extent, like touching a hot element very briefly with a wet finger. If the liquid nitrogen pools anywhere, it will burn severely. As liquid nitrogen evaporates it reduces the oxygen concentration in the air and can act as an asphyxiant, especially in confined spaces. Nitrogen is odorless, colorless, and tasteless and may produce asphyxia without any sensation or prior warning