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Propane is a hydrocarbon gas that can ignite easily when mixed with air. It has a lower flammability limit of just 2.1%, meaning it can start burning at a concentration of only 2.1% propane in the air.
Unlike natural gas, which is lighter than air and rises when leaked, propane vapor is denser than air. This means that if a propane tank leaks, the gas will sink and accumulate at ground level, spreading horizontally.
Propane, like all gases, expands when heated. This means that a propane tank that is safe and stable in cool temperatures can become dangerously pressurized in hot weather. As the temperature rises, the pressure inside the tank increases, putting stress on the tank’s walls and valves.
Proper ventilation is crucial when storing propane tanks, as it allows any leaking gas to safely dissipate into the open air. Unfortunately, many sheds and garages lack adequate ventilation, with few windows or vents to allow air circulation.