American Water Works Water Treatment Plant Operator (WTPO) Practice Test

1 cubic foot of water weighs approximately how many pounds?

8.34 pounds 16 pounds 62.5 pounds 100 pounds

Correct Answer:

100 pounds

Explanation:

A cubic foot of water has a fairly precise weight because water’s density is well known. One cubic foot holds about 7.48 gallons, and each gallon of water weighs roughly 8.34 pounds. Multiplying 7.48 by 8.34 gives about 62 pounds, typically cited as 62.4 pounds per cubic foot at standard conditions. So the weight of a cubic foot of water is around 62 pounds, not 16, 8.34, or 100. The 8.34 pounds figure is the weight of one gallon, while 62.5 pounds is the closest practical match for a cubic foot.

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