Using the graph shown in the illustration, the oil being separated has a specific gravity of 0.87 kg/dm3 at 72.5°C. What will be the specific gravity if the temperature is lowered to 40°C? Illustration MO-0113

Correct Answer: Option C — 0.892 kg/dm3

Petroleum-based liquids expand as temperature increases and contract as it decreases, resulting in a higher specific gravity at cooler temperatures. Utilizing standard centrifugal separation interpolation graphs yields 0.892 kg/dm3 at 40°C for this specific oil grade.