A material that is a gas at 20°C (68°F) or less at an absolute pressure of 101. 325 kPa (14. 7 psia), that is ignitable at an absolute pressure of 101. 325 kPa (14. 7 psia) when in a mixture of 13 percent or less by volume with air, or that has a flammable range at an absolute pressure of 101. 325 kPa (14. 7 psia) with air of at least 12 percent, regardless of the lower limit