It comes down to what it’s made of and thus what it can do.
CH4 is natural gas and used for various purposes to heat up.
Ethyn (C2H2) is used for welding for instance as it burns very hot with oxygen.
Hydrogen is also very flammable because it likes to react with everything.
Nitrogen is an inertgas and doesn’t really react with anything and is used to top of or flush vessels to make sure they don’t react with other gasses that could get in.
There are to many gasses to elaborate fully tho.
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