How much does 1 US Gallon weigh?

One US gallon of water weighs approximately 8.33 pounds. This specific weight is derived from the density of water at standard temperature and pressure conditions. Since water's density is about 62.4 pounds per cubic foot, converting this to gallons (considering that there are 7.48 gallons in a cubic foot), the result comes to approximately 8.33 pounds per gallon.

Understanding the weight of 1 US gallon is important for various plumbing applications, especially when calculating load-bearing capacities, working with fluid dynamics, and estimating the weight of water in different systems. The other options provided do not reflect the standard weight of a gallon of water; they are either underestimations or overestimations based on the typical properties of water.