Liquid helium

From GAWDAwiki

The liquid form of the gas helium, liquid helium, is inert, colorless, odorless, non-corrosive, extremely cold and nonflammable. Vessels and pipes that meet DOT and ASME standards are required for transporting liquid helium because of its extremely cold temperature. ^[1]

References

http://www-safety.deas.harvard.edu/services/helium.html#general