The substance nitrogen has the following properties: normal melting point: 63.2 K normal boiling point: 77.4 K triple point: 0.127 atm, 63.1 K critical point: 33.5 atm, 126.0 K At temperatures above 126 K and pressures above 33.5 atm, N2 is a . N2 does not exist as a liquid at pressures below atm. N2 is a at 0.127 atm and 85.0 K. N2 is a at 5.46 atm and 55.5 K. N2 is a at 1.00 atm and 73.0 K.