Which temperature is used for taking the gravity of fuel?

Which temperature is used for taking the gravity of fuel?

• A. 75F
• B. 60F
• C. 90F
• D. 120F

Answer: (B)

Density (gravity) of fuels changes with temperature: warmer liquids expand and become less dense, while cooler liquids are denser. To compare fuels reliably, the industry uses a standard reference temperature. For petroleum products, that standard is 60°F (15.56°C). Measurements of specific gravity or API gravity are reported at this temperature so values are directly comparable regardless of the liquid’s actual testing temperature. Using a different temperature would require conversion to 60°F, which is why 60°F is the accepted reference. The other temperatures listed would not provide a consistent basis for comparison.

Density (gravity) of fuels changes with temperature: warmer liquids expand and become less dense, while cooler liquids are denser. To compare fuels reliably, the industry uses a standard reference temperature. For petroleum products, that standard is 60°F (15.56°C). Measurements of specific gravity or API gravity are reported at this temperature so values are directly comparable regardless of the liquid’s actual testing temperature. Using a different temperature would require conversion to 60°F, which is why 60°F is the accepted reference. The other temperatures listed would not provide a consistent basis for comparison.