A fluid with SG 1.05 weighs approximately how many pounds per gallon?

A fluid with SG 1.05 weighs approximately how many pounds per gallon?

• A. 8.6
• B. 8.7
• C. 8.8
• D. 8.9

Answer: (B)

Specific gravity tells you how dense a fluid is compared to water, and weight per gallon scales with that density. A gallon of water weighs about 8.3 pounds (roughly 8.34). Multiply by the fluid’s SG of 1.05: 8.3 × 1.05 ≈ 8.715 pounds per gallon, which is about 8.7 lb/gal. Some references use 8.34 lb/gal for water, giving ≈8.76 lb/gal, near 8.8, but for an approximate answer in practice, 8.7 lb/gal is the best fit.

Specific gravity tells you how dense a fluid is compared to water, and weight per gallon scales with that density. A gallon of water weighs about 8.3 pounds (roughly 8.34). Multiply by the fluid’s SG of 1.05: 8.3 × 1.05 ≈ 8.715 pounds per gallon, which is about 8.7 lb/gal. Some references use 8.34 lb/gal for water, giving ≈8.76 lb/gal, near 8.8, but for an approximate answer in practice, 8.7 lb/gal is the best fit.