The substance methane has the following properties: normal melting point: 90.7 K normal boiling point: 109.1 K triple point: 9.2×10-2 atm, 90.6 K critical point: 45.7 atm, 190.7 K At temperatures above 190.7 K and pressures above 45.7 atm, CH4 is a . CH4 does not exist as a liquid at pressures below atm. CH4 is a at 9.20×10-2 atm and 117.0 K. CH4 is a at 1.00 atm and 106.0 K. CH4 is a at 8.62 atm and 82.7 K.