Any fuel that is supplied through pipes or in containers and is a gas at a temperature of 15°C and an absolute pressurof 101.325 kilopascals; and includes (a) biogas, coal gas, liquefied petroleum gas, natural gas, oil gas, producer gas, refinery gas, reformed natural gas, and tempered liquefied petroleum gas: (b) any gaseous substance that the Governor-General declares by Order in Council to be a gas for the purposes of this Act: (c) any mixture of gases