Using the graph shown in the illustration, the oil being separated has a specific gravity of .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 B — 0.892 kg/dm3

Fluid density varies inversely with temperature due to thermal expansion. Utilizing nomograph MO-0113, scaling the oil specific gravity from 0.87 kg/dm³ at 72.5°C down to 40°C results in a calculated higher density of 0.892 kg/dm³ due to thermal contraction of the petroleum fraction.