Gas at a temperature of 20° c and pressure 101.3 KB Pascal can be flammable when mixed with air, 13 percent, subdirectory, or lower, by volume, or have a wide range which can fire 12 percent or more when mixed with air, regardless of the minimum concentration of the mixing. Flammable gas is typically heavier than air. Examples of this group, such as gas, acetylene, LPG gas or LPG, etc.
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