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Why do you list gaseous fuels last?
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Because it's personal opinion?
It's mostly the compressed part. A friend lost his motor home when a propane tank went off like a bottle rocket (allegedly). Uncompressed gas is cheap because it's hard to move to the point of use, isn't it. Especially hydrogen.
Of course I wasn't thinking about steam or compressed air. With very high pressure air, at least it isn't ignitable.