Oh, great question! Yes, salt water is slightly denser, so 5 cubic feet of ocean water tips the scales at around 320 pounds. That’s just 8 pounds more—still enough to make your back ache just thinking about it.
Why does this matter? It explains why ships float higher in salt water—because the water itself is heavier per cubic foot. Cool, right? But for our everyday pond or pool water, we stick with 312 pounds.
Let’s Visualize This Weight
Imagine a standard 55-gallon drum—that holds about 7.4 cubic feet. So 5 cubic feet is a little smaller than one of those big blue barrels. Now picture that barrel filled with water, then try to tip it over—nope, no chance.
Or think about a 120-pound golden retriever. Five cubic feet of water weighs over two and a half of those floppy-eared friends. That’s a lot of slobber—er, weight.
Convert 5 cubic feet to pounds (5 ft³ to lb conversion)
