Discuss how long will this supply of methane last if it is burned at 450 degrees Celsius at a pressure of 102kpa Methane CH4 a natural gas is stored in a 100L tank at -10 degrees Celsius and a pressure of 125atm. the gas is used to provide fuel for a furnace that heats a country home during the winter the furnace consumes an average of 500L of methane a day.