Petroleum Refinery Engineering
Specific gravity of a petroleum product gives an indication of its

Hydrocarbon content type (aromatic or paraffinic)
Sulphur content
Degree of refinement
Ease of atomisation

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Petroleum Refinery Engineering
Mercaptans are

All of these
Added in LPG cylinders to detect gas leakage by its smell
Undesirable in petrol, as they reduce its octane number
Low boiling sulphur compounds

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