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Show llow I'-liii'.um Is ItsllnMl. The rcllulng of petroleum It a proc-rsss proc-rsss of d.atlllatloti. In which It Is aepa-rated aepa-rated Into several marketable prod-ucta. prod-ucta. There ure two methods of dls- tlUutton, known te hnlcallly as "In j vacuo" and "cracking" In the flrat i tho petroleum la iiutll'ed In a partial varutitn, ond In the a-rond. with u- I perheated steam. This process re- colves Its name from tho cracking j aound of the atcBtn as It entera the un- I illstllled petroleum. W |