What is the weight density of water in pounds per cubic foot?

What is the weight density of water in pounds per cubic foot?

• A. 8.34 lb/ft3
• B. 62.4 lb/ft3
• C. 1000 lb/ft3
• D. 3.14 lb/ft3

Answer: (B)

Weight density is how heavy something is per unit volume. For water, the standard freshwater weight density is about 62.4 pounds per cubic foot. This comes from water’s density in common units: roughly 1000 kilograms per cubic meter. When you convert that to pounds and cubic feet, you get about 62.4 lb_f per ft^3. Another way to see it is to start from 8.34 pounds per gallon. Since there are about 7.4805 gallons in a cubic foot, multiplying 8.34 by 7.4805 gives roughly 62.4 lb/ft^3. The other numbers aren’t the weight density of water in those units (they’re either a different unit system or unrelated constants).

Weight density is how heavy something is per unit volume. For water, the standard freshwater weight density is about 62.4 pounds per cubic foot. This comes from water’s density in common units: roughly 1000 kilograms per cubic meter. When you convert that to pounds and cubic feet, you get about 62.4 lb_f per ft^3.

Another way to see it is to start from 8.34 pounds per gallon. Since there are about 7.4805 gallons in a cubic foot, multiplying 8.34 by 7.4805 gives roughly 62.4 lb/ft^3. The other numbers aren’t the weight density of water in those units (they’re either a different unit system or unrelated constants).