One gallon of water weighs approximately how many pounds?

Study for the CWEA Electrical/Instrumentation Level 3 Test. Exercise your knowledge with questions, hints, and explanations to prepare for the exam!

Multiple Choice

One gallon of water weighs approximately how many pounds?

Explanation:
Understanding density and unit conversion helps here. Water’s density is about 1 kilogram per liter, so 1 liter of water weighs ~1 kg. A US gallon is 3.78541 liters, giving roughly 3.785 kg per gallon. Converting that to pounds (1 kg ≈ 2.20462 lb) yields 3.785 × 2.20462 ≈ 8.345 pounds, commonly rounded to 8.34 pounds. The other numbers don’t match a full US gallon for standard conditions.

Understanding density and unit conversion helps here. Water’s density is about 1 kilogram per liter, so 1 liter of water weighs ~1 kg. A US gallon is 3.78541 liters, giving roughly 3.785 kg per gallon. Converting that to pounds (1 kg ≈ 2.20462 lb) yields 3.785 × 2.20462 ≈ 8.345 pounds, commonly rounded to 8.34 pounds. The other numbers don’t match a full US gallon for standard conditions.

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