[hahy-druh-krak-ing] /ˈhaɪ drəˌkræk ɪŋ/

the of petroleum or the like in the presence of hydrogen.
[hahy-druh-krak] /ˈhaɪ drəˌkræk/
verb (used with object)
to crack (petroleum or the like) in the presence of hydrogen.
A process by which the hydrocarbon molecules of petroleum are broken into simpler molecules, as of gasoline or kerosene, by the addition of hydrogen under high pressure and in the presence of a catalyst. See also cracking.


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