Liquid nitrogen is
nitrogen in a liquid state at an extremely low temperature. It is produced industrially by
fractional distillation of
liquid air. Liquid nitrogen is a colorless clear liquid with density of 0.807 g/ml at its
boiling point and a
dielectric constant of 1.43. Liquid nitrogen is often referred to by the abbreviation,
LN2 or "LIN" or "LN" and has the
UN number 1977. Liquid nitrogen is a diatomic liquid, which means that the diatomic character of the covalent N bonding in N
2 gas is retained after
liquefaction.