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OP There are a lot of words with root "pyr-"
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pyrolatry
pyroligneous
pyroligneous acid
pyrolignic
Pyrolignite
Pyrolignous
Pyrolithic
Pyrologist
Pyrology
pyrolusite
pyrolytic
Pyromagnetic
Pyromalate
Pyromalic
pyromancer
pyromancy
pyromania
pyromaniac
Pyromantic
pyrometer
For instance, all petroleum products are made by pyrolysis,
in which the very long carbon chains are broken into shorter
chains. The long chains are lubricating oils and wax from one type of oil, and asphalt in the other kind.
The middle length chains are kerosene. And just a bit shorter, petrol,gasoline. Of course in this process oxygen
has to be excluded. The alchemists knew how to make methyl
alcohol by "destructive distillation" of wood. Most methyl
alcohol is now made from methane by hydrogenation.
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