The substance nitrogen has the following properties: normal melting point: 63.20 K normal boiling point: 77.40 K triple point: 0.127 atm, 63.10 K critical point: 33.5 atm, 126 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 1.35 atm and 55.8 K. N2 is a at 0.127 atm and 84.7 K. N2 is a at 1.00 atm and 70.4 K.