What is the specific weight of water?

The specific weight of water is defined as the weight of water per unit volume and is crucial for various calculations in plumbing design and engineering. At standard temperature and pressure conditions, the specific weight of water is generally accepted to be 62.4 pounds per cubic foot. This value is based on the density of water, which is approximately 62.4 pounds per cubic foot at 39.2°F (4°C), the temperature at which water is densest.

Knowing the specific weight of water is essential for design calculations involving fluid movements, pressures in plumbing systems, and various components such as piping systems, tanks, and fixtures. It helps engineers determine the weight load a plumbing system may impose and design for safety and performance accordingly. This value is a fundamental datum in the field of plumbing design and should be well understood by a certified professional.