What is the weight of a gallon of water?

A gallon of water weighs approximately 8.33 pounds at standard temperature and pressure. This weight is based on the density of water, which is commonly accepted as 62.4 pounds per cubic foot. Since there are 7.48 gallons in one cubic foot, when you divide the weight of water in a cubic foot by the number of gallons, you find the weight of a gallon.

This measure is important in plumbing and other related fields because accurate knowledge of liquid weights is essential for tasks involving fluid dynamics, pressure calculations, and system designs. Understanding the weight of a gallon of water also helps in determining the size and capacity of pipes, tanks, and other plumbing components.

Other options represent values that do not align with the known weight of a gallon of water; thus, they serve to clarify the correct answer by highlighting common misconceptions regarding fluid weight.