A standard barrel equals how many gallons at 60°F?

A standard barrel equals how many gallons at 60°F?

• A. 40 gallons
• B. 42 gallons at 60°F
• C. 45 gallons
• D. 50 gallons

Answer: (B)

Understanding how liquids are measured in practice hinges on temperature. Volume changes with temperature because liquids expand when heated and contract when cooled. To keep comparisons fair and prices consistent, the petroleum industry fixes a standard temperature and a fixed volume. A barrel of oil is defined as 42 US gallons when measured at 60°F. This standardization means a barrel always represents the same amount of liquid in practice, even if the liquid’s temperature varies in storage or transport (its actual volume would differ if measured at a different temperature). Numerically, 42 US gallons is about 158.99 liters. The other numbers in the options aren’t the standard petroleum barrel size, which is why the correct choice specifies 42 gallons at 60°F.

Understanding how liquids are measured in practice hinges on temperature. Volume changes with temperature because liquids expand when heated and contract when cooled. To keep comparisons fair and prices consistent, the petroleum industry fixes a standard temperature and a fixed volume. A barrel of oil is defined as 42 US gallons when measured at 60°F. This standardization means a barrel always represents the same amount of liquid in practice, even if the liquid’s temperature varies in storage or transport (its actual volume would differ if measured at a different temperature). Numerically, 42 US gallons is about 158.99 liters. The other numbers in the options aren’t the standard petroleum barrel size, which is why the correct choice specifies 42 gallons at 60°F.