What is the weight of one US gallon of water?

The weight of one US gallon of water is 8.33 pounds. This value is significant in plumbing and fluid dynamics because it helps professionals calculate pressure, flow rates, and system capacities. Understanding the weight of water is also crucial for tasks such as designing water supply systems or ensuring that storage tanks are appropriately sized and supported.

Water's density is affected by temperature, but for practical purposes and typical conditions, it is accurate to use 8.33 pounds per gallon. This weight makes it easier to perform various calculations related to plumbing systems, such as estimating the total weight of water in a pipeline or reservoir, which is essential for structural considerations.