What is in liquid nitrogen?

Liquid nitrogen is the liquefied form of the element nitrogen that is commercially produced by fractional distillation of liquid air. Like nitrogen gas, it consists of two nitrogen atoms sharing covalent bonds (N 2). read more

Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature. It is a colorless clear liquid with a density of 0.807 g/ml at its boiling point (−195.79 °C (77 K; −320 °F)) and a dielectric constant of 1.43. read more

Liquid nitrogen also has a large expansion ratio on evaporation - one litre of liquid nitrogen can result in about 700 litres of gas - so only a relatively small volume of liquid nitrogen has to evaporate within a room to result in an oxygen deficient atmosphere. read more